[fuchsia] Rename //fuchsia_webengine to //fuchsia_web

Per discussion in https://crrev.com/c/3628363, slightly modify the
purpose of this directory to contain code related to Fuchsia's
`fuchsia.web` FIDL API with `webengine` as one of the subdirectories.
Update READMEs accordingly.

Also, add a BUILD.gn and update //:gn_all to reference it.

Bug: 1081525
Change-Id: I806613c663ca50cc65046eae4f597bf312f9b2c2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3668769
Auto-Submit: David Dorwin <ddorwin@chromium.org>
Commit-Queue: Erik Staab <estaab@chromium.org>
Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Reviewed-by: Erik Staab <estaab@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1008287}

BUILD.gn

@@ -260,12 +260,11 @@ group("gn_all") {
   }
 
   if (is_fuchsia && !is_chromecast) {
+    # Add targets that only exist on Fuchsia.
     deps += [
       ":d8_fuchsia",
       "//build/fuchsia/cipd",
-      "//fuchsia/engine:web_engine",
-      "//fuchsia/runners:cast_runner",
-      "//fuchsia/runners:web_runner",
+      "//fuchsia_web:gn_all",
       "//tools/fuchsia/size_tests:fuchsia_sizes",
 
       # Ensure this target, used by cipd, is built in all configurations.

docs/fuchsia/README.md

@@ -41,7 +41,7 @@ See [Debugging](debug_instructions.md)
 * [Running Telemetry Benchmarks on Fuchsia](telemetry.md)
 
 ## Fuchsia WebEngine and Runners
-See [Fuchsia WebEngine and Runners](../../fuchsia_webengine/README.md).
+See [Fuchsia WebEngine and Runners](../../fuchsia_web/README.md).
 
 ## Resources for developers working on Chromium for Fuchsia
 

fuchsia_web/BUILD.gn

@@ -0,0 +1,19 @@
+# Copyright 2022 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+assert(is_fuchsia)
+
+visibility = [ "//:gn_all" ]
+
+# Ensures every target within this directory is reachable.
+# Used by "//:gn_all".
+# TODO(crbug.com/1081525): Update these to targets within this directory as
+# they are moved.
+group("gn_all") {
+  deps = [
+    "//fuchsia/engine:web_engine",
+    "//fuchsia/runners:cast_runner",
+    "//fuchsia/runners:web_runner",
+  ]
+}

fuchsia_web/DEPS

@@ -1,4 +1,4 @@
 include_rules = [
   # Require explicit include rules for sub-directories.
-  "-fuchsia_webengine",
+  "-fuchsia_web",
 ]

fuchsia_web/README.md

@@ -1,7 +1,9 @@
-# Fuchsia WebEngine and Runners
+# `fuchsia.web` - Fuchsia WebEngine and Runners
 
-This directory contains implementation code for Fuchsia WebEngine and code
-specifically related to it, including the Runners that use it. Code in this
+This directory contains code related to the
+[`fuchsia.web`](https://fuchsia.dev/reference/fidl/fuchsia.web) FIDL API.
+Specifically, it contains the implementation of Fuchsia WebEngine and code
+related to it, including the Runners that use it. Code in this
 directory must not be used outside it and its subdirectories.
 
 General information about Chromium on Fuchsia is
@@ -12,11 +14,19 @@ General information about Chromium on Fuchsia is
 ## Code organization
 Each of the following subdirectories contain code for a specific Fuchsia
 service:
-* `./engine` contains the WebEngine implementation. WebEngine enables
-Fuchsia applications to embed Chromium frames for rendering web content.
+* `./common` contains code shared by both WebEngine and Runners.
 * `./runners`contains implementations of Fuchsia `sys.runner`.
     * `./runners/cast` Enables the Fuchsia system to launch Cast applications.
     * `./runners/web` Enables the Fuchsia system to launch HTTP or HTTPS URLs.
+* `./shell` contains WebEngineShell, a simple wrapper for launching URLs in
+WebEngine from the command line.
+* `./webengine` contains the WebEngine implementation. WebEngine is an
+implementation of
+[`fuchsia.web`](https://fuchsia.dev/reference/fidl/fuchsia.web) that enables
+Fuchsia Components to render web content using Chrome's Content layer.
+* `./webinstance_host` contains code for WebEngine clients to directly
+instantiate a WebInstance Component (`web_instance.cm`) using the WebEngine
+package.
 
 ### Test code
 
@@ -27,8 +37,8 @@ There are 3 major types of tests within this directory:
   code is run inside the browser process, allowing for full access to the
   browser code - but not other processes.
 * Integration tests: Exercise the published FIDL API of a Fuchsia Component. For
-  instance, `//fuchsia_webengine/engine:web_engine_integration_tests` make use
-  of the `//fuchsia_webengine/engine:web_engine` component. The test code runs
+  instance, `//fuchsia_web/webengine:web_engine_integration_tests` make use
+  of the `//fuchsia_web/webengine:web_engine` component. The test code runs
   in a separate process in a separate Fuchsia Component, allowing only access to
   the published API of the component under test.
 
@@ -41,9 +51,9 @@ under test with an explicit file name, either `fake_*`, `test_*`,
 `*_unittest.cc`, `*_ browsertest.cc` or `*_integration_test.cc`.
 
 Test code that is shared across Components should live in `a dedicated ``test`
-directory. For example, the `//fuchsia_webengine/engine/test` directory, which
+directory. For example, the `//fuchsia_web/webengine/test` directory, which
 contains code shared by all browser tests, and
-`//fuchsia_webengine/common/test`, which contains code shared by tests for both
+`//fuchsia_web/common/test`, which contains code shared by tests for both
 WebEngine and Runners.
 
 ## Building and deploying the WebRunner service