Add a simple one shot and repeating timer API for Mojo.js.

gin/test/gtest.h

 // 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.
 
 #ifndef GIN_TEST_GTEST_H_
 #define GIN_TEST_GTEST_H_
 
 #include "v8/include/v8.h"
 
 namespace gin {
 
 // This module provides bindings to gtest. Most tests should use an idiomatic
 // JavaScript testing API, but this module is available for tests that need a
 // low-level integration with gtest.
 class GTest {
  public:
   static const char kModuleName[];
-  static v8::Local<v8::ObjectTemplate> GetTemplate(v8::Isolate* isolate);
+  static v8::Local<v8::Value> GetModule(v8::Isolate* isolate);
 };
 
 }  // namespace gin
 
 #endif  // GIN_TEST_GTEST_H_