Rename org.jni_zero classes when building standalone cronet

Bug: 353534209
Change-Id: I04c972cfa3f6958ef7729339384861b10ffaa68f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5735476
Reviewed-by: Mohannad Farrag <aymanm@google.com>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Stefano Duo <stefanoduo@google.com>
Commit-Queue: Mohamed Heikal <mheikal@chromium.org>
Owners-Override: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1353429}

PRESUBMIT.py

@@ -2294,6 +2294,7 @@ _GENERIC_PYDEPS_FILES = [
     'build/android/gyp/prepare_resources.pydeps',
     'build/android/gyp/process_native_prebuilt.pydeps',
     'build/android/gyp/proguard.pydeps',
+    'build/android/gyp/rename_java_classes.pydeps',
     'build/android/gyp/system_image_apks.pydeps',
     'build/android/gyp/trace_event_bytecode_rewriter.pydeps',
     'build/android/gyp/turbine.pydeps',

build/android/gyp/proguard.py

@@ -61,7 +61,9 @@ _IGNORE_WARNINGS = (
     r'FastServiceLoader\.class:.*Could not inline ServiceLoader\.load',
     # Happens on internal builds. It's a real failure, but happens in dead code.
     r'(?:GeneratedExtensionRegistryLoader|ExtensionRegistryLite)\.class:.*Could not inline ServiceLoader\.load',   # pylint: disable=line-too-long
-
+    # This class is referenced by kotlinx-coroutines-core-jvm but it does not
+    # depend on it. Not actually needed though.
+    r'Missing class org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement',
     # Ignore MethodParameter attribute count isn't matching in espresso.
     # This is a banner warning and each individual file affected will have
     # its own warning.
@@ -70,8 +72,10 @@ _IGNORE_WARNINGS = (
     # corresponding EnclosingMethod attribute. Such InnerClasses attribute
     # entries are ignored."
     r'Warning: InnerClasses attribute has entries missing a corresponding EnclosingMethod attribute',  # pylint: disable=line-too-long
-    r'Warning in obj/third_party/androidx/androidx_test_espresso_espresso_core_java',  # pylint: disable=line-too-long
-    r'Warning in obj/third_party/androidx/androidx_test_espresso_espresso_web_java',  # pylint: disable=line-too-long
+    # Full error example: "Warning in <path to target prebuilt>:
+    # androidx/test/espresso/web/internal/deps/guava/collect/Maps$1.class:"
+    # Also happens in espresso core.
+    r'Warning in .*:androidx/test/espresso/.*/guava/collect/.*',
 
     # We are following up in b/290389974
     r'AppSearchDocumentClassMap\.class:.*Could not inline ServiceLoader\.load',

build/android/gyp/rename_java_classes.py

@@ -0,0 +1,59 @@
+#!/usr/bin/env python3
+#
+# Copyright 2024 The Chromium Authors
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import argparse
+import os
+import sys
+import tempfile
+
+from util import build_utils
+
+sys.path.append(os.path.join(os.path.dirname(__file__), os.pardir, os.pardir))
+
+import zip_helpers
+
+
+def _RenameJars(options):
+  with tempfile.NamedTemporaryFile() as temp:
+    cmd = build_utils.JavaCmd() + [
+        '-cp',
+        options.r8_path,
+        'com.android.tools.r8.relocator.RelocatorCommandLine',
+        '--input',
+        options.input_jar,
+        '--output',
+        temp.name,
+    ]
+    for mapping_rule in options.mapping_rules:
+      cmd += ['--map', mapping_rule]
+
+    build_utils.CheckOutput(cmd)
+    # use zip_helper.merge_zips to hermetize the zip because R8 changes the
+    # times and permissions inside the output jar for some reason.
+    zip_helpers.merge_zips(options.output_jar, [temp.name])
+
+
+def main():
+  parser = argparse.ArgumentParser()
+  parser.add_argument('--output-jar',
+                      required=True,
+                      help='Output file for the renamed classes jar')
+  parser.add_argument('--input-jar',
+                      required=True,
+                      help='Input jar file to rename classes in')
+  parser.add_argument('--r8-path', required=True, help='Path to R8 Jar')
+  parser.add_argument('--map',
+                      action='append',
+                      dest='mapping_rules',
+                      help='List of mapping rules in the form of ' +
+                      '"<original prefix>.**-><new prefix>"')
+  options = parser.parse_args()
+
+  _RenameJars(options)
+
+
+if __name__ == '__main__':
+  main()

build/android/gyp/rename_java_classes.pydeps

@@ -0,0 +1,7 @@
+# Generated by running:
+#   build/print_python_deps.py --root build/android/gyp --output build/android/gyp/rename_java_classes.pydeps build/android/gyp/rename_java_classes.py
+../../gn_helpers.py
+../../zip_helpers.py
+rename_java_classes.py
+util/__init__.py
+util/build_utils.py

build/android/gyp/write_build_config.py

@@ -583,10 +583,18 @@ class OrderedSet(collections.OrderedDict):
   def add(self, key):
     self[key] = True
 
+  def remove(self, key):
+    if key in self:
+      del self[key]
+
   def update(self, iterable):
     for v in iterable:
       self.add(v)
 
+  def difference_update(self, iterable):
+    for v in iterable:
+      self.remove(v)
+
 
 def _ExtractMarkdownDocumentation(input_text):
   """Extract Markdown documentation from a list of input strings lines.
@@ -1744,7 +1752,10 @@ def main(argv):
   if is_java_target or options.type == 'android_app_bundle':
     # The classpath to use to run this target (or as an input to ProGuard).
     device_classpath = []
-    if is_java_target and options.device_jar_path:
+    # dist_jar configs should not list their device jar in their own classpath
+    # since the classpath is used to create the device jar itself.
+    if (is_java_target and options.device_jar_path
+        and options.type != 'dist_jar'):
       device_classpath.append(options.device_jar_path)
     device_classpath.extend(
         c.get('device_jar_path') for c in all_library_deps
@@ -1754,13 +1765,7 @@ def main(argv):
         device_classpath.extend(c for c in d.get('device_classpath', [])
                                 if c not in device_classpath)
 
-  if options.type in ('dist_jar', 'java_binary', 'robolectric_binary'):
-    # The classpath to use to run this target.
-    host_classpath = []
-    if options.host_jar_path:
-      host_classpath.append(options.host_jar_path)
-    host_classpath.extend(c['host_jar_path'] for c in all_library_deps)
-    deps_info['host_classpath'] = host_classpath
+  all_dist_jar_deps = deps.All('dist_jar')
 
   # We allow lint to be run on android_apk targets, so we collect lint
   # artifacts for them.
@@ -1968,6 +1973,78 @@ def main(argv):
     deps_info['proguard_classpath_jars'] = sorted(
         set(extra_proguard_classpath_jars))
 
+  if options.type in ('dist_jar', 'java_binary', 'robolectric_binary'):
+    # The classpath to use to run this target.
+    host_classpath = []
+    if options.host_jar_path:
+      host_classpath.append(options.host_jar_path)
+    host_classpath.extend(c['host_jar_path'] for c in all_library_deps)
+    # Collect all the dist_jar host jars.
+    dist_jar_host_jars = [
+        c['host_jar_path'] for c in all_dist_jar_deps if 'host_jar_path' in c
+    ]
+    # Collect all the jars that went into the dist_jar host jars.
+    dist_jar_host_classpath = set()
+    for c in all_dist_jar_deps:
+      dist_jar_host_classpath.update(c['host_classpath'])
+    # Remove the jars that went into the dist_jar host jars.
+    host_classpath = [
+        p for p in host_classpath if p not in dist_jar_host_classpath
+    ]
+    # Add the dist_jar host jars themselves instead.
+    host_classpath += dist_jar_host_jars
+    deps_info['host_classpath'] = host_classpath
+
+  if is_java_target:
+
+    def _CollectListsFromDeps(deps, key_name):
+      combined = set()
+      for config in deps:
+        combined.update(config.get(key_name, []))
+      return combined
+
+    dist_jar_device_classpath = _CollectListsFromDeps(all_dist_jar_deps,
+                                                      'device_classpath')
+    dist_jar_javac_full_classpath = _CollectListsFromDeps(
+        all_dist_jar_deps, 'javac_full_classpath')
+    dist_jar_javac_full_interface_classpath = _CollectListsFromDeps(
+        all_dist_jar_deps, 'javac_full_interface_classpath')
+    dist_jar_child_dex_files = _CollectListsFromDeps(all_dist_jar_deps,
+                                                     'all_dex_files')
+
+    def _CollectSinglesFromDeps(deps, key_name):
+      return [config[key_name] for config in deps if key_name in config]
+
+    dist_jar_device_jars = _CollectSinglesFromDeps(all_dist_jar_deps,
+                                                   'device_jar_path')
+    dist_jar_combined_dex_files = _CollectSinglesFromDeps(
+        all_dist_jar_deps, 'dex_path')
+    dist_jar_interface_jars = _CollectSinglesFromDeps(all_dist_jar_deps,
+                                                      'interface_jar_path')
+    dist_jar_unprocessed_jars = _CollectSinglesFromDeps(all_dist_jar_deps,
+                                                        'unprocessed_jar_path')
+
+    device_classpath = [
+        p for p in device_classpath if p not in dist_jar_device_classpath
+    ]
+    device_classpath += dist_jar_device_jars
+
+    javac_full_classpath.difference_update(dist_jar_javac_full_classpath)
+    javac_full_classpath.update(dist_jar_unprocessed_jars)
+
+    javac_full_interface_classpath.difference_update(
+        dist_jar_javac_full_interface_classpath)
+    javac_full_interface_classpath.update(dist_jar_interface_jars)
+
+    javac_interface_classpath.update(dist_jar_interface_jars)
+    javac_classpath.update(dist_jar_unprocessed_jars)
+
+    if is_apk_or_module_target or options.type == 'dist_jar':
+      all_dex_files = [
+          p for p in all_dex_files if p not in dist_jar_child_dex_files
+      ]
+      all_dex_files += dist_jar_combined_dex_files
+
   if options.final_dex_path:
     config['final_dex'] = {'path': options.final_dex_path}
   if is_apk_or_module_target or options.type == 'dist_jar':

build/config/android/internal_rules.gni

@@ -3600,8 +3600,8 @@ if (enable_java_templates) {
         _output_name = _main_target_name
       }
 
-      _build_host_jar =
-          _is_java_binary || _is_annotation_processor || _type == "java_library"
+      _build_host_jar = _is_java_binary || _is_annotation_processor ||
+                        _type == "java_library" || _type == "dist_jar"
       _build_device_jar = _type != "system_java_library" && _supports_android
 
       _jacoco_instrument =
@@ -4601,3 +4601,35 @@ template("create_android_app_bundle_module") {
            ]
   }
 }
+
+template("rename_jar_classes") {
+  action_with_pydeps(target_name) {
+    forward_variables_from(invoker, TESTONLY_AND_VISIBILITY)
+    forward_variables_from(invoker,
+                           [
+                             "deps",
+                             "public_deps",
+                           ])
+    script = "//build/android/gyp/rename_java_classes.py"
+    inputs = [
+      _r8_path,
+      invoker.input,
+    ]
+    outputs = [ invoker.output ]
+    args = [
+      "--r8-path",
+      rebase_path(_r8_path, root_build_dir),
+      "--input-jar",
+      rebase_path(invoker.input, root_build_dir),
+      "--output-jar",
+      rebase_path(invoker.output, root_build_dir),
+    ]
+
+    foreach(_rule, invoker.renaming_rules) {
+      args += [
+        "--map",
+        _rule,
+      ]
+    }
+  }
+}

build/config/android/rules.gni

@@ -1434,6 +1434,7 @@ if (!is_robolectric && enable_java_templates) {
   #   direct_deps_only: Do not recurse on deps.
   #   jar_excluded_patterns (optional)
   #     List of globs for paths to exclude.
+  #   renaming_rules: rename java classes inside according to these rules.
   #
   # Example
   #   dist_jar("lib_fatjar") {
@@ -1452,30 +1453,80 @@ if (!is_robolectric && enable_java_templates) {
         defined(invoker.direct_deps_only) && invoker.direct_deps_only
     assert(!(_use_unprocessed_jars && _use_interface_jars),
            "Cannot set both use_interface_jars and use_unprocessed_jars")
+    _supports_android =
+        !defined(invoker.supports_android) || invoker.supports_android
+    _requires_android =
+        defined(invoker.requires_android) && invoker.requires_android
+    _has_renaming_rules = defined(invoker.renaming_rules)
 
-    _jar_target_name = target_name
+    _is_java_target_name =
+        filter_exclude([ target_name ], java_target_patterns) == []
+    _target_name_without_java_or_junit =
+        string_replace(string_replace(target_name, "_java", "_J"),
+                       "_junit",
+                       "_U")
+    _zip_target_name = "${_target_name_without_java_or_junit}_zip"
+    _zip_jar_path = invoker.output
 
-    if (defined(invoker.build_config)) {
-      _build_config = invoker.build_config
-      _build_config_dep = invoker.build_config_dep
+    if (_has_renaming_rules) {
+      _zip_jar_path = "$target_gen_dir/$target_name.singlejar.jar"
+
+      # if we are java-like and have renaming rules, the main target is the
+      # java_library_impl otherwise its the renaming target.
+      if (_is_java_target_name) {
+        _renaming_target_name = "${_target_name_without_java_or_junit}_renamed"
+        _final_jar_target = _renaming_target_name
+      } else {
+        _renaming_target_name = target_name
+      }
     } else {
-      _build_config = "$target_gen_dir/$target_name.build_config.json"
-      _build_config_target_name = "$target_name$build_config_target_suffix"
-      _build_config_dep = ":$_build_config_target_name"
+      # If we dont have renaming rules then the main target is either the zip
+      # target or the java_library_impl if we are java-like.
+      if (_is_java_target_name) {
+        _final_jar_target = _zip_target_name
+      } else {
+        _zip_target_name = target_name
+      }
+    }
 
+    _build_config = "$target_gen_dir/$target_name.build_config.json"
+    _build_config_target_name = "$target_name$build_config_target_suffix"
+    _build_config_dep = ":$_build_config_target_name"
+
+    if (_is_java_target_name) {
+      # If we have a java-like target name we need to provide the expected
+      # meta_targets as well as the processing (eg: ijar, bytecode rewriting)
+      # that is expected of java targets so that other java targets can depend
+      # on us.
+      java_library_impl(target_name) {
+        forward_variables_from(invoker,
+                               [
+                                 "jar_excluded_patterns",
+                                 "deps",
+                               ])
+        type = "dist_jar"
+        if (!defined(deps)) {
+          deps = []
+        }
+        deps += [ ":$_final_jar_target" ]
+
+        supports_android = _supports_android
+        requires_android = _requires_android
+        jar_path = invoker.output
+        enable_bytecode_checks = false
+      }
+    } else {
       write_build_config(_build_config_target_name) {
         type = "dist_jar"
-        supports_android =
-            !defined(invoker.supports_android) || invoker.supports_android
-        requires_android =
-            defined(invoker.requires_android) && invoker.requires_android
+        supports_android = _supports_android
+        requires_android = _requires_android
         possible_config_deps = invoker.deps
         build_config = _build_config
       }
     }
 
     _rebased_build_config = rebase_path(_build_config, root_build_dir)
-    action_with_pydeps(_jar_target_name) {
+    action_with_pydeps(_zip_target_name) {
       forward_variables_from(invoker, [ "data" ])
       script = "//build/android/gyp/zip.py"
       depfile = "$target_gen_dir/$target_name.d"
@@ -1498,13 +1549,13 @@ if (!is_robolectric && enable_java_templates) {
 
       inputs = [ _build_config ]
 
-      outputs = [ invoker.output ]
+      outputs = [ _zip_jar_path ]
 
       args = [
         "--depfile",
         rebase_path(depfile, root_build_dir),
         "--output",
-        rebase_path(invoker.output, root_build_dir),
+        rebase_path(_zip_jar_path, root_build_dir),
         "--no-compress",
       ]
 
@@ -1546,6 +1597,15 @@ if (!is_robolectric && enable_java_templates) {
         args += [ "--input-zips-excluded-globs=$_excludes" ]
       }
     }
+
+    if (_has_renaming_rules) {
+      rename_jar_classes(_renaming_target_name) {
+        input = _zip_jar_path
+        output = invoker.output
+        deps = [ ":$_zip_target_name" ]
+        renaming_rules = invoker.renaming_rules
+      }
+    }
   }
 
   # Combines all dependent .jar files into a single proguarded .dex file.

components/cronet/android/BUILD.gn

@@ -12,6 +12,7 @@ import("//build/config/zip.gni")
 import("//build/util/lastchange.gni")
 import("//build/util/process_version.gni")
 import("//chrome/version.gni")
+import("//components/cronet/android/cronet_test_templates.gni")
 import("//components/cronet/native/include/headers.gni")
 import("//components/grpc_support/include/headers.gni")
 import("//testing/test.gni")
@@ -977,6 +978,10 @@ template("repackage_jars") {
     use_unprocessed_jars = true
     no_build_hooks = true
     jar_excluded_patterns = _excludes
+
+    # This is to prevent clashing with the real jni_zero in apps that include
+    # cronet (eg: google3). See https://crbug.com/353534209
+    renaming_rules = [ "org.jni_zero.**->internal.org.jni_zero" ]
     forward_variables_from(invoker, "*", [ "jar_excluded_patterns" ])
   }
 }
@@ -1384,7 +1389,7 @@ android_library("cronet_javatests") {
   data = [ "//components/cronet/testing/test_server/data/" ]
 }
 
-instrumentation_test_apk("cronet_test_instrumentation_apk") {
+cronet_instrumentation_test_apk("cronet_test_instrumentation_apk") {
   # This is the only Cronet APK with lint enabled. This one was chosen because
   # it depends on basically all source files.
   enable_lint = true
@@ -1532,7 +1537,7 @@ instrumentation_test_apk(
 # Note: The proguard rules includes the test proguard configs as
 # the build system automatically pulls in all transitive proguard
 # configs that can be found through the dependency chain.
-instrumentation_test_apk("cronet_smoketests_apk") {
+cronet_instrumentation_test_apk("cronet_smoketests_apk") {
   apk_name = "CronetSmokeTestInstrumentation"
   android_manifest = "test/javatests/AndroidManifest.xml"
   shared_libraries = [
@@ -1611,7 +1616,7 @@ android_apk("cronet_perf_test_apk") {
   ]
 }
 
-test("cronet_unittests_android") {
+cronet_test("cronet_unittests_android") {
   deps = [
     ":cronet_base_feature_unittest",
     ":cronet_impl_native_java",
@@ -1639,7 +1644,7 @@ test("cronet_unittests_android") {
   }
 }
 
-test("cronet_tests_android") {
+cronet_test("cronet_tests_android") {
   deps = [
     ":cronet_impl_native_java",
     ":cronet_static",

components/cronet/android/cronet_combined_impl_native_proguard_golden.cfg

@@ -133,9 +133,11 @@
 -keep @interface org.chromium.build.annotations.DoNotInline
 -keep @interface org.chromium.build.annotations.UsedByReflection
 -keep @interface org.chromium.build.annotations.IdentifierNameString
--keep @interface org.jni_zero.AccessedByNative
--keep @interface org.jni_zero.CalledByNative
--keep @interface org.jni_zero.CalledByNativeUnchecked
+# ** prefixed since JNI Zero classes included in cronet are jarjared to prevent
+# clashes with the real JNI Zero. See https://crbug.com/353534209
+-keep @interface **org.jni_zero.AccessedByNative
+-keep @interface **org.jni_zero.CalledByNative
+-keep @interface **org.jni_zero.CalledByNativeUnchecked
 
 # Suppress unnecessary warnings.
 -dontnote org.chromium.net.ProxyChangeListener$ProxyReceiver
@@ -169,7 +171,9 @@
 # See crbug.com/1440987. We must keep every native that we are manually
 # registering. If Cronet bumps its min-sdk past 21, we may be able to move to
 # automatic JNI registration.
--keepclasseswithmembers,includedescriptorclasses,allowaccessmodification class org.chromium.**,J.N {
+# ** prefixed since JNI Zero classes included in cronet are jarjared to prevent
+# clashes with the real JNI Zero. See https://crbug.com/353534209
+-keepclasseswithmembers,includedescriptorclasses,allowaccessmodification class org.chromium.**,**J.N {
   native <methods>;
 }
 

components/cronet/android/cronet_impl_native_proguard.cfg

@@ -11,9 +11,11 @@
 -keep @interface org.chromium.build.annotations.DoNotInline
 -keep @interface org.chromium.build.annotations.UsedByReflection
 -keep @interface org.chromium.build.annotations.IdentifierNameString
--keep @interface org.jni_zero.AccessedByNative
--keep @interface org.jni_zero.CalledByNative
--keep @interface org.jni_zero.CalledByNativeUnchecked
+# ** prefixed since JNI Zero classes included in cronet are jarjared to prevent
+# clashes with the real JNI Zero. See https://crbug.com/353534209
+-keep @interface **org.jni_zero.AccessedByNative
+-keep @interface **org.jni_zero.CalledByNative
+-keep @interface **org.jni_zero.CalledByNativeUnchecked
 
 # Suppress unnecessary warnings.
 -dontnote org.chromium.net.ProxyChangeListener$ProxyReceiver
@@ -47,7 +49,9 @@
 # See crbug.com/1440987. We must keep every native that we are manually
 # registering. If Cronet bumps its min-sdk past 21, we may be able to move to
 # automatic JNI registration.
--keepclasseswithmembers,includedescriptorclasses,allowaccessmodification class org.chromium.**,J.N {
+# ** prefixed since JNI Zero classes included in cronet are jarjared to prevent
+# clashes with the real JNI Zero. See https://crbug.com/353534209
+-keepclasseswithmembers,includedescriptorclasses,allowaccessmodification class org.chromium.**,**J.N {
   native <methods>;
 }
 

components/cronet/android/cronet_test_templates.gni

@@ -0,0 +1,77 @@
+# Copyright 2024 The Chromium Authors
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/android/rules.gni")
+import("//testing/test.gni")
+
+template("cronet_renamed_jar") {
+  dist_jar(target_name) {
+    forward_variables_from(invoker, TESTONLY_AND_VISIBILITY)
+    forward_variables_from(invoker, "*", TESTONLY_AND_VISIBILITY)
+    supports_android = true
+    requires_android = true
+
+    if (!defined(invoker.output)) {
+      output = "$target_out_dir/$target_name.distjar.jar"
+    }
+
+    jar_excluded_patterns = [
+      "*/*GEN_JNI.class",
+      "META-INF/*",
+    ]
+    renaming_rules = [ "org.jni_zero.**->internal.org.jni_zero" ]
+  }
+}
+
+# Drop in replacement for the instrumentation_test_apk() template that renames
+# java classes in the same way the classes shipped in cronet jars are renamed.
+template("cronet_instrumentation_test_apk") {
+  _single_jar_target_name = "${target_name}_single_jar_java"
+  cronet_renamed_jar(_single_jar_target_name) {
+    forward_variables_from(invoker, TESTONLY_AND_VISIBILITY)
+
+    # Implicit java deps that are added by the test template that might need to
+    # be renamed.
+    deps =
+        invoker.deps + [ "//testing/android/instrumentation:test_runner_java" ]
+    testonly = true
+  }
+
+  instrumentation_test_apk(target_name) {
+    forward_variables_from(invoker, TESTONLY_AND_VISIBILITY)
+    forward_variables_from(invoker, "*", TESTONLY_AND_VISIBILITY)
+    deps += [ ":$_single_jar_target_name" ]
+  }
+}
+
+# Drop in replacement for the test() template that renames java classes in the
+# same way the classes shipped in  cronet jars are renamed.
+template("cronet_test") {
+  _single_jar_target_name = "${target_name}_single_jar_java"
+  cronet_renamed_jar(_single_jar_target_name) {
+    forward_variables_from(invoker, TESTONLY_AND_VISIBILITY)
+
+    # Implicit java deps that are added by the test template that might need to
+    # be renamed.
+    deps = invoker.deps + [
+             "//base/test:test_support_java",
+             "//testing/android/native_test:native_test_java",
+           ]
+    testonly = true
+  }
+
+  test(target_name) {
+    forward_variables_from(invoker, TESTONLY_AND_VISIBILITY)
+    forward_variables_from(invoker, "*", TESTONLY_AND_VISIBILITY)
+    deps += [ ":$_single_jar_target_name" ]
+  }
+}
+
+# cronet_test defaults.
+# Should be kept in sync with set_defaults("test") in //testing/test.gni
+set_defaults("cronet_test") {
+  configs = default_shared_library_configs
+  configs -= [ "//build/config/android:hide_all_but_jni_onload" ]
+  configs += [ "//build/config/android:hide_all_but_jni" ]
+}

net/BUILD.gn

@@ -20,6 +20,7 @@ import("//url/features.gni")
 if (is_android) {
   import("//build/config/android/config.gni")
   import("//build/config/android/rules.gni")
+  import("//components/cronet/android/cronet_test_templates.gni")
   import("//third_party/jni_zero/jni_zero.gni")
 } else if (is_mac) {
   import("//build/config/mac/mac_sdk.gni")
@@ -2555,7 +2556,13 @@ if (!is_cronet_build) {
   }
 }
 
-test("net_unittests") {
+if (is_cronet_build) {
+  _test_target_type = "cronet_test"
+} else {
+  _test_target_type = "test"
+}
+
+target(_test_target_type, "net_unittests") {
   sources = [
     "base/address_family_unittest.cc",
     "base/address_list_unittest.cc",

testing/test.gni

@@ -1259,9 +1259,14 @@ template("isolated_script_test") {
 # Test defaults.
 set_defaults("test") {
   if (is_android) {
+    # Should be kept in sync with set_defaults("cronet_test") in
+    # //components/cronet/android/cronet_test_templates.gni
+    # LINT.IfChange
     configs = default_shared_library_configs
     configs -= [ "//build/config/android:hide_all_but_jni_onload" ]
     configs += [ "//build/config/android:hide_all_but_jni" ]
+
+    # LINT.ThenChange(/components/cronet/android/cronet_test_templates.gni)
   } else {
     configs = default_executable_configs
   }

third_party/jni_zero/jni_zero.gni

@@ -39,6 +39,15 @@ if (target_os == "android") {
   jni_headers_dir = "$root_gen_dir/jni_headers"
 }
 
+_cronet_renaming_extra_args = [
+  # keep in sync with //components/cronet/android/BUILD.gn renaming_rules
+  "--package-prefix",
+  "internal",
+
+  "--package-prefix-filter",
+  "org.jni_zero",
+]
+
 _jni_zero_dir = "//third_party/jni_zero"
 
 template("jni_sources_list") {
@@ -261,6 +270,11 @@ template("generate_jni_registration") {
     if (defined(invoker.module_name)) {
       args += [ "--module-name=${invoker.module_name}" ]
     }
+
+    # Cronet needs to rename jni_zero classes
+    if (defined(is_cronet_build) && is_cronet_build) {
+      args += _cronet_renaming_extra_args
+    }
   }
 }
 
@@ -368,6 +382,11 @@ template("generate_jni_impl") {
         if (defined(invoker.namespace)) {
           args += [ "--namespace=${invoker.namespace}" ]
         }
+
+        # Cronet needs to rename jni_zero classes
+        if (defined(is_cronet_build) && is_cronet_build) {
+          args += _cronet_renaming_extra_args
+        }
       } else {
         if (is_robolectric) {
           not_needed(invoker, [ "jar_file" ])