Change mojo JS bindings to expose a handle object, which is Closed when garbage

gin/gin.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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     {
@@ skipping 85 matching lines @@
         '../v8/tools/gyp/v8.gyp:v8',
         'gin',
       ],
       'export_dependent_settings': [
         '../testing/gtest.gyp:gtest',
         'gin',
       ],
       'sources': [
         'test/file_runner.cc',
         'test/file_runner.h',
+        'test/gc.cc',
+        'test/gc.h',
         'test/gtest.cc',
         'test/gtest.h',
         'test/v8_test.cc',
         'test/v8_test.h',
       ],
     },
     {
       'target_name': 'gin_unittests',
       'type': 'executable',
       'dependencies': [
         '../base/base.gyp:run_all_unittests',
         '../v8/tools/gyp/v8.gyp:v8',
         'gin_test',
       ],
       'sources': [
         'converter_unittest.cc',
         'interceptor_unittest.cc',
         'modules/module_registry_unittest.cc',
         'modules/timer_unittest.cc',
         'per_context_data_unittest.cc',
         'shell_runner_unittest.cc',
         'test/run_all_unittests.cc',
         'test/run_js_tests.cc',
         'wrappable_unittest.cc',
       ],
     },
   ],
 }