Re-land "Convert native handles to buffers before encoding."

webrtc/modules/video_coding/main/source/generic_encoder.h

 /*
  *  Copyright (c) 2012 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 120 matching lines @@
     uint32_t FrameRate() const;
 
     int32_t SetPeriodicKeyFrames(bool enable);
 
     int32_t RequestFrame(const std::vector<FrameType>& frame_types);
 
     bool InternalSource() const;
 
     void OnDroppedFrame();
 
+    bool SupportsNativeHandle() const;
+
 private:
     VideoEncoder* const encoder_;
     VideoEncoderRateObserver* const rate_observer_;
     VCMEncodedFrameCallback*  vcm_encoded_frame_callback_;
     uint32_t bit_rate_;
     uint32_t frame_rate_;
     const bool internal_source_;
     mutable rtc::CriticalSection rates_lock_;
     VideoRotation rotation_;
 }; // end of VCMGenericEncoder class
 
 }  // namespace webrtc
 
 #endif // WEBRTC_MODULES_VIDEO_CODING_GENERIC_ENCODER_H_