Add MediaStreamSource frame rate calculation to the tracker.

content/browser/renderer_host/media/peer_connection_tracker_host.cc

Index: content/browser/renderer_host/media/peer_connection_tracker_host.cc
diff --git a/content/browser/renderer_host/media/peer_connection_tracker_host.cc b/content/browser/renderer_host/media/peer_connection_tracker_host.cc
index cae185d65985b417d0abfd58a768f7cb7b87bbb6..2626a25b29f0eaaddf7cda01ea482ea821b4b328 100644
--- a/content/browser/renderer_host/media/peer_connection_tracker_host.cc
+++ b/content/browser/renderer_host/media/peer_connection_tracker_host.cc
@@ -27,6 +27,8 @@ bool PeerConnectionTrackerHost::OnMessageReceived(const IPC::Message& message) {
                         OnUpdatePeerConnection)
     IPC_MESSAGE_HANDLER(PeerConnectionTrackerHost_AddStats, OnAddStats)
     IPC_MESSAGE_HANDLER(PeerConnectionTrackerHost_GetUserMedia, OnGetUserMedia)
+    IPC_MESSAGE_HANDLER(PeerConnectionTrackerHost_AddVideoStats,
+                        OnAddVideoStats)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
@@ -106,6 +108,13 @@ void PeerConnectionTrackerHost::OnGetUserMedia(
                                                  video_constraints);
 }
 
+void PeerConnectionTrackerHost::OnAddVideoStats(const std::string& video_id,
+                                                float input_frame_rate,
+                                                int number_of_dropped_frames) {
+  WebRTCInternals::GetInstance()->OnAddVideoStats(
+      peer_pid(), video_id, input_frame_rate, number_of_dropped_frames);
+}
+
 void PeerConnectionTrackerHost::OnSuspend() {
   BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
       base::Bind(&PeerConnectionTrackerHost::SendOnSuspendOnUIThread, this));