Creating new gn arg: enable_all_proguard_optimizations.

build/android/gyp/write_build_config.py

Index: build/android/gyp/write_build_config.py
diff --git a/build/android/gyp/write_build_config.py b/build/android/gyp/write_build_config.py
index 9f5e3e3af15b8fe3b357f590672bf313d93c01b2..3671db72ea4679e0279ca28c171c83b1f1a3e418 100755
--- a/build/android/gyp/write_build_config.py
+++ b/build/android/gyp/write_build_config.py
@@ -253,6 +253,8 @@ def main(argv):
 
   # apk options
   parser.add_option('--apk-path', help='Path to the target\'s apk output.')
+  parser.add_option('--apk-for-test-path',
+                    help='Path to the target\'s testable apk output.')
   parser.add_option('--incremental-apk-path',
                     help="Path to the target's incremental apk output.")
   parser.add_option('--incremental-install-script-path',
@@ -394,6 +396,7 @@ def main(argv):
       deps_info['dex_path'] = options.dex_path
     if options.type == 'android_apk':
       deps_info['apk_path'] = options.apk_path
+      deps_info['apk_for_test_path'] = options.apk_for_test_path
       deps_info['incremental_apk_path'] = options.incremental_apk_path
       deps_info['incremental_install_script_path'] = (
           options.incremental_install_script_path)