Rewrite CreateBlackFrame in webrtcvideoengine.

webrtc/common_video/include/video_frame_buffer.h

 /*
  *  Copyright (c) 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 70 matching lines @@
  protected:
   virtual ~VideoFrameBuffer();
 };
 
 // Plain I420 buffer in standard memory.
 class I420Buffer : public VideoFrameBuffer {
  public:
   I420Buffer(int width, int height);
   I420Buffer(int width, int height, int stride_y, int stride_u, int stride_v);
 
+  static rtc::scoped_refptr<I420Buffer> Create(int width, int height);
+  static rtc::scoped_refptr<I420Buffer> Create(int width,
+                                               int height,
+                                               int stride_y,
+                                               int stride_u,
+                                               int stride_v);
+
   // Sets all three planes to all zeros. Used to work around for
   // quirks in memory checkers
   // (https://bugs.chromium.org/p/libyuv/issues/detail?id=377) and
   // ffmpeg (http://crbug.com/390941).
   // TODO(nisse): Should be deleted if/when those issues are resolved
   // in a better way.
   void InitializeData();
 
   // Sets the frame buffer to all black.
   void SetToBlack();
@@ skipping 110 matching lines @@
   const uint8_t* const v_plane_;
   const int y_stride_;
   const int u_stride_;
   const int v_stride_;
   rtc::Callback0<void> no_longer_used_cb_;
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_COMMON_VIDEO_INCLUDE_VIDEO_FRAME_BUFFER_H_