Report encoded frame size in VideoSendStream.

Implements reporting transmitted frame size in WebRtcVideoEngine2.

R=mflodman@webrtc.org, stefan@webrtc.org
BUG=4033

Review URL: https://webrtc-codereview.appspot.com/33399004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@7772 4adac7df-926f-26a2-2b94-8c16560cd09d

webrtc/modules/video_coding/codecs/interface/mock/mock_video_codec_interface.h

@@ -21,7 +21,7 @@ namespace webrtc {
 
 class MockEncodedImageCallback : public EncodedImageCallback {
  public:
-  MOCK_METHOD3(Encoded, int32_t(EncodedImage& encodedImage,
+  MOCK_METHOD3(Encoded, int32_t(const EncodedImage& encodedImage,
                                 const CodecSpecificInfo* codecSpecificInfo,
                                 const RTPFragmentationHeader* fragmentation));
 };