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

webrtc/media/base/fakevideocapturer.h

 /*
  *  Copyright (c) 2004 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 82 matching lines @@
     // VideoCapturerTest.SinkWantsMaxPixelAndMaxPixelCountStepUp
     // depends on this.
     if (AdaptFrame(width, height, 0, 0, &adapted_width, &adapted_height,
                    &crop_width, &crop_height, &crop_x, &crop_y, nullptr)) {
       rtc::scoped_refptr<webrtc::I420Buffer> buffer(
           webrtc::I420Buffer::Create(adapted_width, adapted_height));
       buffer->InitializeData();
 
       OnFrame(webrtc::VideoFrame(
                   buffer, rotation_,
+                  is_screencast_ ? webrtc::VideoContentType::kScreenshare
+                                 : webrtc::VideoContentType::kDefault,
                   next_timestamp_ / rtc::kNumNanosecsPerMicrosec),
               width, height);
     }
     next_timestamp_ += timestamp_interval;
 
     return true;
   }
 
   sigslot::signal1<FakeVideoCapturer*> SignalDestroyed;
 
@@ skipping 26 matching lines @@
   bool running_;
   int64_t initial_timestamp_;
   int64_t next_timestamp_;
   const bool is_screencast_;
   webrtc::VideoRotation rotation_;
 };
 
 }  // namespace cricket
 
 #endif  // WEBRTC_MEDIA_BASE_FAKEVIDEOCAPTURER_H_