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

webrtc/test/fake_texture_frame.cc

 /*
  *  Copyright (c) 2016 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.
  */
 
 #include "webrtc/test/fake_texture_frame.h"
 
 namespace webrtc {
 namespace test {
 
 VideoFrame FakeNativeHandle::CreateFrame(FakeNativeHandle* native_handle,
                                          int width,
                                          int height,
                                          uint32_t timestamp,
                                          int64_t render_time_ms,
                                          VideoRotation rotation) {
   return VideoFrame(new rtc::RefCountedObject<FakeNativeHandleBuffer>(
                         native_handle, width, height),
-                    timestamp, render_time_ms, rotation);
+                    timestamp, render_time_ms, rotation, kVideoContent_Default);
 }
 }  // namespace test
 }  // namespace webrtc