getUserMedia: handle the device starting status report.

content/renderer/media/user_media_client_impl.h

Index: content/renderer/media/user_media_client_impl.h
diff --git a/content/renderer/media/user_media_client_impl.h b/content/renderer/media/user_media_client_impl.h
index 7c7224887f9f7af648ec882d76299e91e6c2bf6f..fd0cde4da9ef31f404cc0c9b7e449d5c5fb06267 100644
--- a/content/renderer/media/user_media_client_impl.h
+++ b/content/renderer/media/user_media_client_impl.h
@@ -229,10 +229,10 @@ class CONTENT_EXPORT UserMediaClientImpl
 
   // Callback function triggered when all native versions of the
   // underlying media sources and tracks have been created and started.
-  void OnCreateNativeTracksCompleted(
-      UserMediaRequestInfo* request,
-      MediaStreamRequestResult result,
-      const blink::WebString& result_name);
+  void OnCreateNativeTracksCompleted(const std::string& label,
+                                     UserMediaRequestInfo* request,
+                                     MediaStreamRequestResult result,
+                                     const blink::WebString& result_name);
 
   void OnStreamGeneratedForCancelledRequest(
       const StreamDeviceInfoArray& audio_array,