Add ChildMessageFilter, a base class for renderer/worker cross-thread MessageFilter

content/renderer/render_thread_impl.cc

 // 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.
 
 #include "content/renderer/render_thread_impl.h"
 
 #include <algorithm>
 #include <limits>
 #include <map>
 #include <vector>
@@ skipping 353 matching lines @@
   audio_input_message_filter_ =
       new AudioInputMessageFilter(GetIOMessageLoopProxy());
   AddFilter(audio_input_message_filter_.get());
 
   audio_message_filter_ = new AudioMessageFilter(GetIOMessageLoopProxy());
   AddFilter(audio_message_filter_.get());
 
   midi_message_filter_ = new MIDIMessageFilter(GetIOMessageLoopProxy());
   AddFilter(midi_message_filter_.get());
 
-  AddFilter(new IndexedDBMessageFilter(thread_safe_sender()));
+  AddFilter((new IndexedDBMessageFilter(thread_safe_sender()))->GetFilter());
 
   GetContentClient()->renderer()->RenderThreadStarted();
 
   const CommandLine& command_line = *CommandLine::ForCurrentProcess();
   if (command_line.HasSwitch(switches::kEnableGpuBenchmarking))
       RegisterExtension(GpuBenchmarkingExtension::Get());
 
 #if defined(USE_TCMALLOC) && (defined(OS_LINUX) || defined(OS_ANDROID))
   if (command_line.HasSwitch(switches::kEnableMemoryBenchmarking))
     RegisterExtension(MemoryBenchmarkingExtension::Get());
@@ skipping 962 matching lines @@
   if (!gamepad_shared_memory_reader_)
     gamepad_shared_memory_reader_.reset(new GamepadSharedMemoryReader);
   gamepad_shared_memory_reader_->SampleGamepads(*data);
 }
 
 base::ProcessId RenderThreadImpl::renderer_process_id() const {
   return renderer_process_id_;
 }
 
 }  // namespace content