mojo: Fix html_viewer build break from https://codereview.chromium.org/1115443002

components/html_viewer/blink_platform_impl.cc

 // Copyright 2014 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.
 
 #include "components/html_viewer/blink_platform_impl.h"
 
 #include <cmath>
 
 #include "base/command_line.h"
 #include "base/rand_util.h"
 #include "base/stl_util.h"
 #include "base/synchronization/waitable_event.h"
+#include "base/thread_task_runner_handle.h"
 #include "base/threading/platform_thread.h"
 #include "base/time/time.h"
 #include "components/html_viewer/blink_resource_constants.h"
 #include "components/html_viewer/web_clipboard_impl.h"
 #include "components/html_viewer/web_cookie_jar_impl.h"
 #include "components/html_viewer/web_message_port_channel_impl.h"
 #include "components/html_viewer/web_socket_handle_impl.h"
 #include "components/html_viewer/web_thread_impl.h"
 #include "components/html_viewer/web_url_loader_impl.h"
 #include "net/base/data_url.h"
@@ skipping 232 matching lines @@
   return new WebThreadImpl(name);
 }
 
 blink::WebThread* BlinkPlatformImpl::currentThread() {
   WebThreadImplForMessageLoop* thread =
       static_cast<WebThreadImplForMessageLoop*>(current_thread_slot_.Get());
   if (thread)
     return (thread);
 
   scoped_refptr<base::MessageLoopProxy> message_loop =
       base::MessageLoopProxy::current();

[msw, 2015/04/28 17:50:11]

This file might need an explicit base/message_loop/message_loop.h include.

   if (!message_loop.get())
     return NULL;
 
   thread = new WebThreadImplForMessageLoop(message_loop.get());
   current_thread_slot_.Set(thread);
   return thread;
 }
 
 void BlinkPlatformImpl::yieldCurrentThread() {
   base::PlatformThread::YieldCurrentThread();
@@ skipping 35 matching lines @@
 }
 
 // static
 void BlinkPlatformImpl::DestroyCurrentThread(void* thread) {
   WebThreadImplForMessageLoop* impl =
       static_cast<WebThreadImplForMessageLoop*>(thread);
   delete impl;
 }
 
 }  // namespace html_viewer