Add AsyncWaiter implementation to java API.

mojo/mojo.gyp

 # Copyright 2013 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.
 
 {
   'target_defaults': {
     'conditions': [
       ['mojo_shell_debug_url != ""', {
         'defines': [
           'MOJO_SHELL_DEBUG=1',
@@ skipping 707 matching lines @@
           'sources': [
             'android/system/core_impl.cc',
             'android/system/core_impl.h',
           ],
         },
         {
           'target_name': 'libmojo_java_unittest',
           'type': 'shared_library',
           'dependencies': [
             '../base/base.gyp:base',
+            '../base/base.gyp:test_support_base',
             'libmojo_system_java',
             'mojo_jni_headers',
           ],
           'sources': [
             'android/javatests/core_test.cc',
             'android/javatests/core_test.h',
             'android/javatests/init_library.cc',
           ],
         },
         {
@@ skipping 142 matching lines @@
             'aura/screen_mojo.cc',
             'aura/screen_mojo.h',
             'aura/window_tree_host_mojo.cc',
             'aura/window_tree_host_mojo.h',
           ],
         },
       ],
     }],
   ],
 }