aw: Configurable system_webview_apk package name

android_webview/BUILD.gn

 # Copyright 2015 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.
 
 import("//build/config/android/config.gni")
 import("//build/config/android/rules.gni")
 import("//build/config/locales.gni")
 import("//tools/grit/repack.gni")
 import("system_webview_apk_tmpl.gni")
 import("webview_repack_locales.gni")
 
+declare_args() {
+  # Package name of the system_webview_apk target.
+  system_webview_package_name = "com.android.webview"
+}
+
 if (!defined(use_webview_internal_framework)) {
   use_webview_internal_framework = false
 }
 
 group("android_webview") {
   if (!use_webview_internal_framework) {
     deps = [
       ":system_webview_apk",
     ]
   }
 }
 
 jinja_template("system_webview_manifest") {
   input = "apk/java/AndroidManifest.xml"
   output = "$target_gen_dir/system_webview_manifest/AndroidManifest.xml"
+  variables = [ "package=$system_webview_package_name" ]
 }
 
 webview_repack_locales("repack_locales") {
   input_locales = locales
   output_locales = locales
 }
 
 locale_pak_resources("locale_paks") {
   sources = [
     "$root_out_dir/android_webview/locales/am.pak",
@@ skipping 111 matching lines @@
     webview_license_path,
   ]
   args = [
     "notice",
     rebase_path(webview_license_path),
   ]
 }
 
 android_resources("system_webview_resources") {
   resource_dirs = [ "apk/java/res" ]
-  custom_package = "com.android.webview"
+  custom_package = system_webview_package_name
 }
 
 android_resources("resources") {
   resource_dirs = [ "java/res" ]
   custom_package = "org.chromium.android_webview"
   deps = [
     ":locale_paks",
     ":strings_grd",
   ]
 }
@@ skipping 480 matching lines @@
     android_manifest = get_target_outputs(":system_webview_manifest")
     android_manifest = android_manifest[1]
     android_manifest_dep = ":system_webview_manifest"
     deps = [
       ":system_webview_resources",
       "//android_webview/glue",
     ]
     apk_name = "SystemWebView"
   }
 }