getUserMedia: handle the device starting status report.

content/browser/renderer_host/media/media_stream_dispatcher_host.cc

Index: content/browser/renderer_host/media/media_stream_dispatcher_host.cc
diff --git a/content/browser/renderer_host/media/media_stream_dispatcher_host.cc b/content/browser/renderer_host/media/media_stream_dispatcher_host.cc
index 3a2e040afd6b9fa1ba51048567b565ba387971d6..68046699bff2655058ca5bc4ab5a7ae0b0a5ce1b 100644
--- a/content/browser/renderer_host/media/media_stream_dispatcher_host.cc
+++ b/content/browser/renderer_host/media/media_stream_dispatcher_host.cc
@@ -91,6 +91,7 @@ bool MediaStreamDispatcherHost::OnMessageReceived(const IPC::Message& message) {
                         OnCloseDevice)
     IPC_MESSAGE_HANDLER(MediaStreamHostMsg_SetCapturingLinkSecured,
                         OnSetCapturingLinkSecured)
+    IPC_MESSAGE_HANDLER(MediaStreamHostMsg_StreamStarted, OnStreamStarted)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
@@ -182,4 +183,10 @@ void MediaStreamDispatcherHost::OnSetCapturingLinkSecured(int session_id,
                                                  type, is_secure);
 }
 
+void MediaStreamDispatcherHost::OnStreamStarted(const std::string& label) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+
+  media_stream_manager_->OnStreamStarted(label);
+}
+
 }  // namespace content