Adding a skeleton MediaStreamCenter.

content/renderer/render_view_impl.cc

Index: content/renderer/render_view_impl.cc
diff --git a/content/renderer/render_view_impl.cc b/content/renderer/render_view_impl.cc
index c8eb6106082a7d61f915f9cd3fcf3912b8c4bb16..10967f65d5b817fab3eb21c8334454028dfdb3e9 100644
--- a/content/renderer/render_view_impl.cc
+++ b/content/renderer/render_view_impl.cc
@@ -586,6 +586,15 @@ WebKit::WebPeerConnectionHandler* RenderViewImpl::CreatePeerConnectionHandler(
   return media_stream_impl_->CreatePeerConnectionHandler(client);
 }
 
+WebKit::WebMediaStreamCenter* RenderViewImpl::CreateMediaStreamCenter(
+    WebKit::WebMediaStreamCenterClient* client) {
+  const CommandLine* cmd_line = CommandLine::ForCurrentProcess();
+  if (!cmd_line->HasSwitch(switches::kEnableMediaStream))
+    return NULL;
+  EnsureMediaStreamImpl();
+  return media_stream_impl_->CreateMediaStreamCenter(client);
+}
+
 void RenderViewImpl::AddObserver(RenderViewObserver* observer) {
   observers_.AddObserver(observer);
 }