Introduce a monotonic_clock module for Mojo.js.

mojo/apps/js/bindings/monotonic_clock.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 MOJO_APPS_JS_BINDINGS_THREADING_H_
-#define MOJO_APPS_JS_BINDINGS_THREADING_H_
+#ifndef MOJO_APPS_JS_BINDING_MONOTONIC_CLOCK_H_
+#define MOJO_APPS_JS_BINDING_MONOTONIC_CLOCK_H_
 
-#include "gin/public/wrapper_info.h"
 #include "v8/include/v8.h"
 
 namespace mojo {
 namespace apps {
 
-class Threading {
+class MonotonicClock {
  public:
   static const char kModuleName[];
   static v8::Local<v8::Value> GetModule(v8::Isolate* isolate);
- private:
-  Threading();
 };
 
 }  // namespace apps
 }  // namespace mojo
 
-#endif  // MOJO_APPS_JS_BINDINGS_THREADING_H_
+#endif  // MOJO_APPS_JS_BINDING_MONOTONIC_CLOCK_H_