Reland of Add content type information to encoded images and corresponding rtp extension header

webrtc/sdk/android/src/jni/androidmediaencoder_jni.cc

 /*
  *  Copyright 2015 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 1024 matching lines @@
     webrtc::EncodedImageCallback::Result callback_result(
         webrtc::EncodedImageCallback::Result::OK);
     if (callback_) {
       std::unique_ptr<webrtc::EncodedImage> image(
           new webrtc::EncodedImage(payload, payload_size, payload_size));
       image->_encodedWidth = width_;
       image->_encodedHeight = height_;
       image->_timeStamp = output_timestamp_;
       image->capture_time_ms_ = output_render_time_ms_;
       image->rotation_ = output_rotation_;
+      image->content_type_ =
+          (codec_mode_ == webrtc::VideoCodecMode::kScreensharing)
+              ? webrtc::VideoContentType::SCREENSHARE
+              : webrtc::VideoContentType::UNSPECIFIED;
       image->_frameType =
           (key_frame ? webrtc::kVideoFrameKey : webrtc::kVideoFrameDelta);
       image->_completeFrame = true;
       webrtc::CodecSpecificInfo info;
       memset(&info, 0, sizeof(info));
       info.codecType = codec_type;
       if (codec_type == kVideoCodecVP8) {
         info.codecSpecific.VP8.pictureId = picture_id_;
         info.codecSpecific.VP8.nonReference = false;
         info.codecSpecific.VP8.simulcastIdx = 0;
@@ skipping 289 matching lines @@
   }
 }
 
 void MediaCodecVideoEncoderFactory::DestroyVideoEncoder(
     webrtc::VideoEncoder* encoder) {
   ALOGD << "Destroy video encoder.";
   delete encoder;
 }
 
 }  // namespace webrtc_jni