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 6813666bd0f0d709b918d0d580aa923678cabda7..2d9dc06025893f478992fdff81744aba64a438b4 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"
 
@@ -237,6 +238,7 @@ class VideoReceiver {
   VCMProcessTimer _receiveStatsTimer;
   VCMProcessTimer _retransmissionTimer;
   VCMProcessTimer _keyRequestTimer;
+  QpParser qp_parser_;
 };
 
 }  // namespace vcm