Adding a skeleton MediaStreamCenter.

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 f4a9d66d96ebb70b1ac18dd5c17d5f92515f0981..4806d3b340420ad9c9234b8e5629b6113b107e5b 100644
--- a/content/renderer/render_thread_impl.cc
+++ b/content/renderer/render_thread_impl.cc
@@ -48,6 +48,7 @@
 #include "content/renderer/gpu/compositor_thread.h"
 #include "content/renderer/media/audio_input_message_filter.h"
 #include "content/renderer/media/audio_message_filter.h"
+#include "content/renderer/media/media_stream_center.h"
 #include "content/renderer/media/video_capture_impl_manager.h"
 #include "content/renderer/media/video_capture_message_filter.h"
 #include "content/renderer/plugin_channel_host.h"
@@ -209,6 +210,8 @@ void RenderThreadImpl::Init() {
   main_thread_indexed_db_dispatcher_.reset(
       IndexedDBDispatcher::ThreadSpecificInstance());
 
+  media_stream_center_ = NULL;
+
   db_message_filter_ = new DBMessageFilter();
   AddFilter(db_message_filter_.get());
 
@@ -924,6 +927,17 @@ GpuChannelHost* RenderThreadImpl::EstablishGpuChannelSync(
   return GetGpuChannel();
 }
 
+WebKit::WebMediaStreamCenter* RenderThreadImpl::CreateMediaStreamCenter(
+    WebKit::WebMediaStreamCenterClient* client) {
+  if (!CommandLine::ForCurrentProcess()->HasSwitch(
+      switches::kEnableMediaStream)) {
+    return NULL;
+  }
+  if (!media_stream_center_)
+    media_stream_center_ = new content::MediaStreamCenter(client);
+  return media_stream_center_;
+}
+
 GpuChannelHost* RenderThreadImpl::GetGpuChannel() {
   if (!gpu_channel_.get())
     return NULL;