Shutdown renderer main message loop before blink::shutdown()

content/child/child_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_CHILD_CHILD_THREAD_IMPL_H_
 #define CONTENT_CHILD_CHILD_THREAD_IMPL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 164 matching lines @@
   QuotaMessageFilter* quota_message_filter() const {
     return quota_message_filter_.get();
   }
 
   ChildResourceMessageFilter* child_resource_message_filter() const {
     return resource_message_filter_.get();
   }
 
   base::MessageLoop* message_loop() const { return message_loop_; }
 
+  base::SingleThreadTaskRunner* main_task_runner() const {

[kinuko, 2016/08/09 14:12:18]

main_thread_->main_task_runner() looks slightly cryptic, what 'main' stands for
here? 

+    return main_task_runner_.get();
+  }
+
   // Returns the one child thread. Can only be called on the main thread.
   static ChildThreadImpl* current();
 
 #if defined(OS_ANDROID)
   // Called on Android's service thread to shutdown the main thread of this
   // process.
   static void ShutdownThread();
 #endif
 
  protected:
@@ skipping 70 matching lines @@
 
   // Handles resource loads for this process.
   std::unique_ptr<ResourceDispatcher> resource_dispatcher_;
 
   // The OnChannelError() callback was invoked - the channel is dead, don't
   // attempt to communicate.
   bool on_channel_error_called_;
 
   base::MessageLoop* message_loop_;
 
+  scoped_refptr<base::SingleThreadTaskRunner> main_task_runner_;
+
   std::unique_ptr<FileSystemDispatcher> file_system_dispatcher_;
 
   std::unique_ptr<QuotaDispatcher> quota_dispatcher_;
 
   scoped_refptr<ChildHistogramMessageFilter> histogram_message_filter_;
 
   scoped_refptr<ChildResourceMessageFilter> resource_message_filter_;
 
   scoped_refptr<ServiceWorkerMessageFilter> service_worker_message_filter_;
 
@@ skipping 56 matching lines @@
 
  private:
   struct Options options_;
 
   DISALLOW_COPY_AND_ASSIGN(Builder);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_CHILD_THREAD_IMPL_H_