[TimeZoneMonitor] Decouple renderer side impl from content to blink.

third_party/WebKit/public/platform/Platform.h

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 123 matching lines @@
   typedef HANDLE FileHandle;
 #else
   typedef int FileHandle;
 #endif
 
   // Initialize platform and wtf. If you need to initialize the entire Blink,
   // you should use blink::initialize.
   static void initialize(Platform*);
   static void shutdown();
   static Platform* current();
+  // Used to get whether message loop is ready for current thread, to help
+  // blink::initialize() determining whether can initialize mojo stuff or not.

[haraken, 2016/10/27 16:13:15]

Add a TODO to remove this public API by ensuring a message loop before calling
blink::initialize().

[leonhsl(Using Gerrit), 2016/10/28 05:59:06]

Done.

+  static bool isMessageLoopReady();
 
   // Used to switch the current platform only for testing.
   static void setCurrentPlatformForTesting(Platform*);
 
   // May return null.
   virtual WebCookieJar* cookieJar() { return nullptr; }
 
   // Must return non-null.
   virtual WebClipboard* clipboard() { return nullptr; }
 
@@ skipping 525 matching lines @@
  protected:
   Platform();
   virtual ~Platform() {}
 
   WebThread* m_mainThread;
 };
 
 }  // namespace blink
 
 #endif