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

webrtc/modules/video_coding/utility/video_coding_utility.gyp

Index: webrtc/modules/video_coding/utility/video_coding_utility.gyp
diff --git a/webrtc/modules/video_coding/utility/video_coding_utility.gyp b/webrtc/modules/video_coding/utility/video_coding_utility.gyp
index d5628489a9e4db034ce2be18a9b8ed11d56a8d5d..f0764bb7bf74492e3535a290c0bca89c3d1e3eed 100644
--- a/webrtc/modules/video_coding/utility/video_coding_utility.gyp
+++ b/webrtc/modules/video_coding/utility/video_coding_utility.gyp
@@ -21,8 +21,10 @@
         'frame_dropper.cc',
         'include/frame_dropper.h',
         'include/moving_average.h',
+        'include/qp_parser.h',
         'include/quality_scaler.h',
         'include/vp8_header_parser.h',
+        'qp_parser.cc',
         'quality_scaler.cc',
         'vp8_header_parser.cc',
       ],