📱 Add enable_chrome_android_internal GN flag

build/config/android/config.gni

 # Copyright 2014 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.
 
 # This file contains common system config stuff for the Android build.
 
 if (is_android) {
   import("//build_overrides/build.gni")
 
   has_chrome_android_internal =
       exec_script("//build/dir_exists.py",
                   [ rebase_path("//clank", root_build_dir) ],
                   "string") == "True"
 
-  if (has_chrome_android_internal) {
+  # We are using a separate declare_args block for only this argument so that
+  # we can decide if we have to pull in definitions from the internal config
+  # early.
+  declare_args() {
+    # Enables using the internal Chrome for Android repository. The default
+    # value depends on whether the repository is available, and if it's not but
+    # this argument is manually set to True, the generation will fail.
+    # The main purpose of this argument is to avoid having to maintain 2
+    # repositories to support both public only and internal builds.
+    enable_chrome_android_internal = has_chrome_android_internal
+  }
+
+  if (enable_chrome_android_internal) {
     import("//clank/config.gni")
   }
 
   if (!defined(extra_chrome_shared_library_configs)) {
     extra_chrome_shared_library_configs = []
   }
 
   if (!defined(default_android_ndk_root)) {
     default_android_ndk_root = "//third_party/android_tools/ndk"
     default_android_ndk_version = "r12b"
@@ skipping 327 matching lines @@
           "//build/toolchain/android:android_${android_secondary_abi_cpu}"
     }
   }
 }
 
 declare_args() {
   # Enables used resource whitelist generation. Set for official builds only
   # as a large amount of build output is generated.
   enable_resource_whitelist_generation = is_android && is_official_build
 }