Add stats for average QP per frame for VP8 (for received video streams).

webrtc/modules/video_coding/main/source/video_coding_impl.h

Index: webrtc/modules/video_coding/main/source/video_coding_impl.h
diff --git a/webrtc/modules/video_coding/main/source/video_coding_impl.h b/webrtc/modules/video_coding/main/source/video_coding_impl.h
index 86a8ca01cb89f8f3cb0b1fa301fc26a030d7f80d..061407d27612816a03d824e56d72ed0775d083e3 100644
--- a/webrtc/modules/video_coding/main/source/video_coding_impl.h
+++ b/webrtc/modules/video_coding/main/source/video_coding_impl.h
@@ -25,6 +25,7 @@
 #include "webrtc/modules/video_coding/main/source/media_optimization.h"
 #include "webrtc/modules/video_coding/main/source/receiver.h"
 #include "webrtc/modules/video_coding/main/source/timing.h"
+#include "webrtc/modules/video_coding/utility/include/qp_parser.h"
 #include "webrtc/system_wrappers/interface/clock.h"
 #include "webrtc/system_wrappers/interface/critical_section_wrapper.h"
 
@@ -238,6 +239,7 @@ class VideoReceiver {
   VCMProcessTimer _receiveStatsTimer;
   VCMProcessTimer _retransmissionTimer;
   VCMProcessTimer _keyRequestTimer;
+  QpParser qp_parser_;
 };
 
 }  // namespace vcm