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

webrtc/modules/video_coding/encoded_frame.h

 /*
  *  Copyright (c) 2011 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 59 matching lines @@
   int64_t RenderTimeMs() const { return _renderTimeMs; }
   /**
   *   Get frame type
   */
   webrtc::FrameType FrameType() const { return _frameType; }
   /**
   *   Get frame rotation
   */
   VideoRotation rotation() const { return rotation_; }
   /**
-  *   True if this frame is complete, false otherwise
-  */
+   *  Get video content type
+   */
+  VideoContentType contentType() const { return content_type_; }
+  /**
+   *   True if this frame is complete, false otherwise
+   */
   bool Complete() const { return _completeFrame; }
   /**
   *   True if there's a frame missing before this frame
   */
   bool MissingFrame() const { return _missingFrame; }
   /**
   *   Payload type of the encoded payload
   */
   uint8_t PayloadType() const { return _payloadType; }
   /**
@@ skipping 27 matching lines @@
 
   // Video rotation is only set along with the last packet for each frame
   // (same as marker bit). This |_rotation_set| is only for debugging purpose
   // to ensure we don't set it twice for a frame.
   bool _rotation_set;
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_VIDEO_CODING_ENCODED_FRAME_H_