Reland of Update test code to use I420Buffer when writing pixel data.

webrtc/common_video/libyuv/include/webrtc_libyuv.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 76 matching lines @@
 //   - src_frame        : Pointer to a source frame.
 //   - crop_x/crop_y    : Starting positions for cropping (0 for no crop).
 //   - src_width        : src width in pixels.
 //   - src_height       : src height in pixels.
 //   - sample_size      : Required only for the parsing of MJPG (set to 0 else).
 //   - rotate           : Rotation mode of output image.
 // Output:
 //   - dst_frame        : Reference to a destination frame.
 // Return value: 0 if OK, < 0 otherwise.
 
+// TODO(nisse): Deprecated, see
+// https://bugs.chromium.org/p/webrtc/issues/detail?id=5921.
 int ConvertToI420(VideoType src_video_type,
                   const uint8_t* src_frame,
                   int crop_x,
                   int crop_y,
                   int src_width,
                   int src_height,
                   size_t sample_size,
                   VideoRotation rotation,
                   VideoFrame* dst_frame);
 
 // Convert From I420
 // Input:
 //   - src_frame        : Reference to a source frame.
 //   - dst_video_type   : Type of output video.
 //   - dst_sample_size  : Required only for the parsing of MJPG.
 //   - dst_frame        : Pointer to a destination frame.
 // Return value: 0 if OK, < 0 otherwise.
 // It is assumed that source and destination have equal height.
 int ConvertFromI420(const VideoFrame& src_frame,
                     VideoType dst_video_type,
                     int dst_sample_size,
                     uint8_t* dst_frame);
 
 // Compute PSNR for an I420 frame (all planes).
 // Returns the PSNR in decibel, to a maximum of kInfinitePSNR.
 double I420PSNR(const VideoFrame* ref_frame, const VideoFrame* test_frame);
+double I420PSNR(const VideoFrameBuffer& ref_buffer,
+                const VideoFrameBuffer& test_buffer);
+
 // Compute SSIM for an I420 frame (all planes).
 double I420SSIM(const VideoFrame* ref_frame, const VideoFrame* test_frame);
+double I420SSIM(const VideoFrameBuffer& ref_buffer,
+                const VideoFrameBuffer& test_buffer);
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_COMMON_VIDEO_LIBYUV_INCLUDE_WEBRTC_LIBYUV_H_