Add QP sum stats for received streams.

webrtc/pc/statscollector_unittest.cc

 /*
  *  Copyright 2014 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 2001 matching lines @@
   StatsReports reports;  // returned values.
   cricket::VideoReceiverInfo video_receiver_info;
   cricket::VideoMediaInfo stats_read;
 
   AddIncomingVideoTrackStats();
   stats.AddStream(stream_);
 
   // Construct a stats value to read.
   video_receiver_info.add_ssrc(1234);
   video_receiver_info.frames_decoded = 10;
+  video_receiver_info.qp_sum = rtc::Optional<uint64_t>(11);
   stats_read.receivers.push_back(video_receiver_info);
 
   EXPECT_CALL(session_, video_channel()).WillRepeatedly(Return(&video_channel));
   EXPECT_CALL(session_, voice_channel()).WillRepeatedly(ReturnNull());
   EXPECT_CALL(*media_channel, GetStats(_))
       .WillOnce(DoAll(SetArgPointee<0>(stats_read), Return(true)));
   stats.UpdateStats(PeerConnectionInterface::kStatsOutputLevelStandard);
   stats.GetStats(NULL, &reports);
   EXPECT_EQ(rtc::ToString(video_receiver_info.frames_decoded),
             ExtractSsrcStatsValue(reports,
                                   StatsReport::kStatsValueNameFramesDecoded));
+  EXPECT_EQ(rtc::ToString(*video_receiver_info.qp_sum),
+            ExtractSsrcStatsValue(reports, StatsReport::kStatsValueNameQpSum));
 }
 
 }  // namespace webrtc