Extract google_apis gn args to a gni file

This will allow other gn file to use these variables

Change-Id: I4005f1f4a124a19cfe7d2c45b6b3ca68475879c9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6298157
Commit-Queue: Olivier Robin <olivierrobin@chromium.org>
Reviewed-by: Boris Sazonov <bsazonov@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1425112}

google_apis/BUILD.gn

@@ -6,27 +6,11 @@ import("//build/buildflag_header.gni")
 import("//build/config/chrome_build.gni")
 import("//build/config/features.gni")
 import("//extensions/buildflags/buildflags.gni")
+import("//google_apis/config.gni")
 import("//testing/test.gni")
 import("//third_party/protobuf/proto_library.gni")
 
 declare_args() {
-  # Set the variable 'use_official_google_api_keys' to true
-  # to use the Google-internal file containing official API keys
-  # even in a developer build.  Setting this variable explicitly to
-  # true will cause the build to fail if the internal file is missing.
-  #
-  # Set the variable to false to not use the internal file, even for
-  # Chrome-branded builds or when it exists in your checkout.
-  #
-  # Leave it set to "" to have the variable implicitly set to true for
-  # Chrome-branded builds or if
-  # //src/google_apis/internal/google_chrome_api_keys.h is present and false
-  # otherwise.
-  # This does not apply to iOS builds, which use different mechanisms and always
-  # evaluate to use_official_google_api_keys=false.
-  # See https://crbug.com/1183709.
-  use_official_google_api_keys = ""
-
   # Set these to bake the specified API keys and OAuth client
   # IDs/secrets into your build.
   #

google_apis/config.gni

@@ -0,0 +1,22 @@
+# Copyright 2025 The Chromium Authors
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+declare_args() {
+  # Set the variable 'use_official_google_api_keys' to true
+  # to use the Google-internal file containing official API keys
+  # even in a developer build.  Setting this variable explicitly to
+  # true will cause the build to fail if the internal file is missing.
+  #
+  # Set the variable to false to not use the internal file, even for
+  # Chrome-branded builds or when it exists in your checkout.
+  #
+  # Leave it set to "" to have the variable implicitly set to true for
+  # Chrome-branded builds or if
+  # //src/google_apis/internal/google_chrome_api_keys.h is present and false
+  # otherwise.
+  # This does not apply to iOS builds, which use different mechanisms and always
+  # evaluate to use_official_google_api_keys=false.
+  # See https://crbug.com/1183709.
+  use_official_google_api_keys = ""
+}