Re-land 16025005 with fix for statics perf issue

content/renderer/render_thread_impl.cc

Index: content/renderer/render_thread_impl.cc
diff --git a/content/renderer/render_thread_impl.cc b/content/renderer/render_thread_impl.cc
index 795a92a355d148b36efa13eac9d989c83734d42b..72e7fb5a1ee58a3a99c69733fb890d1779944ff5 100644
--- a/content/renderer/render_thread_impl.cc
+++ b/content/renderer/render_thread_impl.cc
@@ -65,6 +65,7 @@
 #include "content/renderer/media/audio_renderer_mixer_manager.h"
 #include "content/renderer/media/media_stream_center.h"
 #include "content/renderer/media/media_stream_dependency_factory.h"
+#include "content/renderer/media/midi_message_filter.h"
 #include "content/renderer/media/peer_connection_tracker.h"
 #include "content/renderer/media/video_capture_impl_manager.h"
 #include "content/renderer/media/video_capture_message_filter.h"
@@ -368,6 +369,9 @@ void RenderThreadImpl::Init() {
   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);
 
   GetContentClient()->renderer()->RenderThreadStarted();