Pending tasks in a message loop should be deleted before shutting down Blink

content/renderer/render_thread_impl.h

 // Copyright (c) 2012 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 CONTENT_RENDERER_RENDER_THREAD_IMPL_H_
 #define CONTENT_RENDERER_RENDER_THREAD_IMPL_H_
 
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 103 matching lines @@
 // The routing IDs correspond to RenderView instances.
 class CONTENT_EXPORT RenderThreadImpl : public RenderThread,
                                         public ChildThread,
                                         public GpuChannelHostFactory {
  public:
   static RenderThreadImpl* current();
 
   RenderThreadImpl();
   // Constructor that's used when running in single process mode.
   explicit RenderThreadImpl(const std::string& channel_name);
+  // Constructor that's used in RendererMain.
+  explicit RenderThreadImpl(scoped_ptr<base::MessageLoop> main_message_loop);
   ~RenderThreadImpl() override;
   void Shutdown() override;
 
   // When initializing WebKit, ensure that any schemes needed for the content
   // module are registered properly.  Static to allow sharing with tests.
   static void RegisterSchemes();
 
   // Notify V8 that the date/time configuration of the system might have
   // changed.
   static void NotifyTimezoneChange();
@@ skipping 384 matching lines @@
   // Timer that periodically calls IdleHandler.
   base::RepeatingTimer<RenderThreadImpl> idle_timer_;
 
   // The channel from the renderer process to the GPU process.
   scoped_refptr<GpuChannelHost> gpu_channel_;
 
   // Cache of variables that are needed on the compositor thread by
   // GpuChannelHostFactory methods.
   scoped_refptr<base::MessageLoopProxy> io_message_loop_proxy_;
 
+  // The message loop of the renderer main thread.
+  // This message loop should be destructed before the RenderThreadImpl
+  // shuts down Blink.
+  scoped_ptr<base::MessageLoop> main_message_loop_;
+
   // A lazily initiated thread on which file operations are run.
   scoped_ptr<base::Thread> file_thread_;
 
   // May be null if overridden by ContentRendererClient.
   scoped_ptr<base::Thread> compositor_thread_;
 
   // Thread for running multimedia operations (e.g., video decoding).
   scoped_ptr<base::Thread> media_thread_;
 
   // Will point to appropriate MessageLoopProxy after initialization,
@@ skipping 38 matching lines @@
   bool is_one_copy_enabled_;
 
   std::map<int, mojo::MessagePipeHandle> pending_render_frame_connects_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderThreadImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDER_THREAD_IMPL_H_