Implement ConstraintNotSatisfiedError for getusermedia

content/renderer/media/media_stream_video_source.h

Index: content/renderer/media/media_stream_video_source.h
diff --git a/content/renderer/media/media_stream_video_source.h b/content/renderer/media/media_stream_video_source.h
index c2f6f179366a25d8b0b8c4875dd80b4ff8088778..80575ff551526291546688e3c68bda6e802a221d 100644
--- a/content/renderer/media/media_stream_video_source.h
+++ b/content/renderer/media/media_stream_video_source.h
@@ -111,7 +111,7 @@ class CONTENT_EXPORT MediaStreamVideoSource
   virtual void StartSourceImpl(
       const media::VideoCaptureParams& params,
       const VideoCaptureDeliverFrameCB& frame_callback) = 0;
-  void OnStartDone(bool success);
+  void OnStartDone(MediaStreamRequestResult result);
 
   // An implementation must immediately stop capture video frames and must not
   // call OnSupportedFormats after this method has been called. After this
@@ -135,7 +135,8 @@ class CONTENT_EXPORT MediaStreamVideoSource
   // fulfilled.
   bool FindBestFormatWithConstraints(
       const media::VideoCaptureFormats& formats,
-      media::VideoCaptureFormat* best_format);
+      media::VideoCaptureFormat* best_format,
+      blink::WebString* unsatisfied_constraint);
 
   // Trigger all cached callbacks from AddTrack. AddTrack is successful
   // if the capture delegate has started and the constraints provided in
@@ -144,7 +145,8 @@ class CONTENT_EXPORT MediaStreamVideoSource
   // in the context of the callback. If gUM fail, the implementation will
   // simply drop the references to the blink source and track which will lead
   // to that this object is deleted.
-  void FinalizeAddTrack();
+  void FinalizeAddTrack(MediaStreamRequestResult result,
+                        const blink::WebString& result_name);
 
   State state_;
   bool muted_state_;