aw: Configurable system_webview_apk package name

android_webview/BUILD.gn

Index: android_webview/BUILD.gn
diff --git a/android_webview/BUILD.gn b/android_webview/BUILD.gn
index 2498a1ca44843c2a21df73d84c6a403febf74246..30856d9d7206ad5b6ad38edd53a117e856d90ed8 100644
--- a/android_webview/BUILD.gn
+++ b/android_webview/BUILD.gn
@@ -9,6 +9,11 @@ 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
 }
@@ -24,6 +29,7 @@ group("android_webview") {
 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") {
@@ -155,7 +161,7 @@ action("generate_webview_license_notice") {
 
 android_resources("system_webview_resources") {
   resource_dirs = [ "apk/java/res" ]
-  custom_package = "com.android.webview"
+  custom_package = system_webview_package_name
 }
 
 android_resources("resources") {