Implement googContentType GetStats metric reported on receive side.

webrtc/api/statstypes.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 442 matching lines @@
       return "candidateType";
 
     case kStatsValueNameChannelId:
       return "googChannelId";
     case kStatsValueNameCodecName:
       return "googCodecName";
     case kStatsValueNameComponent:
       return "googComponent";
     case kStatsValueNameContentName:
       return "googContentName";
+    case kStatsValueNameContentType:
+      return "googContentType";
     case kStatsValueNameCpuLimitedResolution:
       return "googCpuLimitedResolution";
     case kStatsValueNameDecodingCTSG:
       return "googDecodingCTSG";
     case kStatsValueNameDecodingCTN:
       return "googDecodingCTN";
     case kStatsValueNameDecodingMutedOutput:
       return "googDecodingMuted";
     case kStatsValueNameDecodingNormal:
       return "googDecodingNormal";
@@ skipping 323 matching lines @@
 // Looks for a report with the given |id|.  If one is not found, null
 // will be returned.
 StatsReport* StatsCollection::Find(const StatsReport::Id& id) {
   RTC_DCHECK(thread_checker_.CalledOnValidThread());
   Container::iterator it = std::find_if(list_.begin(), list_.end(),
       [&id](const StatsReport* r)->bool { return r->id()->Equals(id); });
   return it == list_.end() ? nullptr : *it;
 }
 
 }  // namespace webrtc