[Android] Add gyp 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 1422 matching lines @@
           'variables': {
             'java_in_dir': '../base/android/java',
             'jar_excluded_classes': [ '*/NativeLibraries.class' ],
           },
           'dependencies': [
             'base_java_application_state',
             'base_java_library_load_from_apk_status_codes',
             'base_java_library_process_type',
             'base_java_memory_pressure_level',
             'base_native_libraries_gen',
+            '../third_party/android_tools/android_tools.gyp:android_support_multidex_javalib',
             '../third_party/jsr-305/jsr-305.gyp:jsr_305_javalib',
           ],
           'includes': [ '../build/java.gypi' ],
         },
         {
           # GN: //base:base_java_unittest_support
           'target_name': 'base_java_unittest_support',
           'type': 'none',
           'dependencies': [
             'base_java',
@@ skipping 30 matching lines @@
           },
           'includes': [ '../build/android/java_cpp_enum.gypi' ],
         },
         {
           # GN: //base:base_java_test_support
           'target_name': 'base_java_test_support',
           'type': 'none',
           'dependencies': [
             'base_java',
             '../testing/android/on_device_instrumentation.gyp:reporter_java',
+            '../third_party/android_tools/android_tools.gyp:android_support_multidex_javalib',
           ],
           'variables': {
             'java_in_dir': '../base/test/android/javatests',
           },
           'includes': [ '../build/java.gypi' ],
         },
         {
           # GN: //base:base_junit_tests
           'target_name': 'base_junit_tests',
           'type': 'none',
@@ skipping 119 matching lines @@
             '../build/isolate.gypi',
           ],
           'sources': [
             'base_unittests.isolate',
           ],
         },
       ],
     }],
   ],
 }