Re-land 16025005 with fix for statics perf issue

content/renderer/render_thread_impl.h

Index: content/renderer/render_thread_impl.h
diff --git a/content/renderer/render_thread_impl.h b/content/renderer/render_thread_impl.h
index 63cc80cbff7eb3d196eb57ae53c38c45f540d4e1..9ef70021927a67e065c1b7676cc1638d82bbc2fd 100644
--- a/content/renderer/render_thread_impl.h
+++ b/content/renderer/render_thread_impl.h
@@ -81,6 +81,7 @@ class InputEventFilter;
 class InputHandlerManager;
 class MediaStreamCenter;
 class MediaStreamDependencyFactory;
+class MIDIMessageFilter;
 class P2PSocketDispatcher;
 class PeerConnectionTracker;
 class RendererWebKitPlatformSupportImpl;
@@ -227,6 +228,9 @@ class CONTENT_EXPORT RenderThreadImpl : public RenderThread,
     return audio_message_filter_.get();
   }
 
+  MIDIMessageFilter* midi_message_filter() {
+    return midi_message_filter_.get();
+  }
 
   // Creates the embedder implementation of WebMediaStreamCenter.
   // The resulting object is owned by WebKit and deleted by WebKit at tear-down.
@@ -379,6 +383,7 @@ class CONTENT_EXPORT RenderThreadImpl : public RenderThread,
   scoped_refptr<DBMessageFilter> db_message_filter_;
   scoped_refptr<AudioInputMessageFilter> audio_input_message_filter_;
   scoped_refptr<AudioMessageFilter> audio_message_filter_;
+  scoped_refptr<MIDIMessageFilter> midi_message_filter_;
   scoped_refptr<DevToolsAgentFilter> devtools_agent_message_filter_;
 
   scoped_ptr<MediaStreamDependencyFactory> media_stream_factory_;