getUserMedia: handle the device starting status report.

content/browser/renderer_host/media/media_stream_dispatcher_host_unittest.cc

Index: content/browser/renderer_host/media/media_stream_dispatcher_host_unittest.cc
diff --git a/content/browser/renderer_host/media/media_stream_dispatcher_host_unittest.cc b/content/browser/renderer_host/media/media_stream_dispatcher_host_unittest.cc
index c71b1a47ded4f6b7b8ae06bac32c73e45c89ab35..d4a940e09d994e9c95e94818dd08f27d1aba11f1 100644
--- a/content/browser/renderer_host/media/media_stream_dispatcher_host_unittest.cc
+++ b/content/browser/renderer_host/media/media_stream_dispatcher_host_unittest.cc
@@ -122,6 +122,10 @@ class MockMediaStreamDispatcherHost : public MediaStreamDispatcherHost,
         render_frame_id, page_request_id, device_id, type, security_origin);
   }
 
+  void OnStreamStarted(const std::string label) {
+    MediaStreamDispatcherHost::OnStreamStarted(label);
+  }
+
   std::string label_;
   StreamDeviceInfoArray audio_devices_;
   StreamDeviceInfoArray video_devices_;
@@ -164,6 +168,9 @@ class MockMediaStreamDispatcherHost : public MediaStreamDispatcherHost,
       StreamDeviceInfoArray video_device_list) {
     OnStreamGenerated(current_ipc_->routing_id(), request_id,
                       audio_device_list.size(), video_device_list.size());
+    // Simulate the stream started event back to host for UI testing.
+    OnStreamStarted(label);
+
     // Notify that the event have occurred.
     base::Closure quit_closure = quit_closures_.front();
     quit_closures_.pop();