[Android] Add gn support for multidex.

base/base.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'includes': [
     '../build/win_precompile.gypi',
@@ skipping 1452 matching lines @@
           # GN: //base:base_multidex_gen
           'target_name': 'base_multidex_gen',
           'type': 'none',
           'sources': [
             'android/java/templates/ChromiumMultiDex.template',
           ],
           'variables': {
             'package_name': 'org/chromium/base/multidex',
             'template_deps': [],
             'additional_gcc_preprocess_options': [
-              '--defines', 'CONFIGURATION_NAME_<(CONFIGURATION_NAME)',
+              '--defines', 'MULTIDEX_CONFIGURATION_<(CONFIGURATION_NAME)',
             ],
           },
           'includes': ['../build/android/java_cpp_template.gypi'],
         },
         {
           # GN: //base:base_android_java_enums_srcjar
           'target_name': 'base_java_library_process_type',
           'type': 'none',
           'variables': {
             'source_file': 'android/library_loader/library_loader_hooks.h',
@@ skipping 231 matching lines @@
             '../build/isolate.gypi',
           ],
           'sources': [
             'base_unittests.isolate',
           ],
         },
       ],
     }],
   ],
 }