Add SEI to the list of packets counted as keyframe.

webrtc/modules/rtp_rtcp/source/rtp_format_h264.cc

 /*
  *  Copyright (c) 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 83 matching lines @@
   if (nal_type == kSps) {
     H264SpsParser parser(nalu_start, nalu_length);
     if (parser.Parse()) {
       parsed_payload->type.Video.width = parser.width();
       parsed_payload->type.Video.height = parser.height();
     }
   }
   switch (nal_type) {
     case kSps:
     case kPps:
+    case kSei:
     case kIdr:
       parsed_payload->frame_type = kVideoFrameKey;
       break;
     default:
       parsed_payload->frame_type = kVideoFrameDelta;
       break;
   }
   return true;
 }
 
@@ skipping 251 matching lines @@
     // will depacketize the STAP-A into NAL units later.
     if (!ParseSingleNalu(parsed_payload, payload_data, payload_data_length))
       return false;
   }
 
   parsed_payload->payload = payload_data + offset;
   parsed_payload->payload_length = payload_data_length - offset;
   return true;
 }
 }  // namespace webrtc