Actually use --extra-r-text-files in process_resources.py

build/java_apk.gypi

 # Copyright (c) 2012 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 is meant to be included into a target to provide a rule
 # to build Android APKs in a consistent manner.
 #
 # To use this, create a gyp target with the following form:
 # {
 #   'target_name': 'my_package_apk',
@@ skipping 592 matching lines @@
           ['is_test_apk == 1', {
             'dependencies_res_zip_paths=': [],
             'additional_res_packages=': [],
           }],
           ['res_v14_verify_only == 1', {
             'process_resources_options+': ['--v14-verify-only']
           }],
           ['shared_resources == 1', {
             'process_resources_options+': ['--shared-resources']
           }],
+          ['R_package != ""', {
+            'process_resources_options+': ['--custom-package', '<(R_package)']
+          }],
         ],
       },
       'inputs': [
         '<(DEPTH)/build/android/gyp/util/build_utils.py',
         '<(DEPTH)/build/android/gyp/process_resources.py',
         '<(android_manifest_path)',
         '>@(additional_input_paths)',
         '>@(resource_input_paths)',
         '>@(dependencies_res_zip_paths)',
         '>(inputs_list_file)',
@@ skipping 331 matching lines @@
         '-DEMMA_INSTRUMENT=<(emma_instrument)',
         '-DEMMA_DEVICE_JAR=<(emma_device_jar)',
 
         '-Dbasedir=.',
         '-buildfile',
         '<(DEPTH)/build/android/ant/apk-package.xml',
       ]
     },
   ],
 }