Move MutableDataY{,U,V} methods to I420Buffer only.

webrtc/common_video/libyuv/include/webrtc_libyuv.h

Index: webrtc/common_video/libyuv/include/webrtc_libyuv.h
diff --git a/webrtc/common_video/libyuv/include/webrtc_libyuv.h b/webrtc/common_video/libyuv/include/webrtc_libyuv.h
index ec3720e442bc9621fb9e7cdb6696c964073051f7..17f7b4ad3c47a37432517c2aaef3fc691bda802c 100644
--- a/webrtc/common_video/libyuv/include/webrtc_libyuv.h
+++ b/webrtc/common_video/libyuv/include/webrtc_libyuv.h
@@ -68,6 +68,7 @@ size_t CalcBufferSize(VideoType type, int width, int height);
 //                    already open for writing.
 // Return value: 0 if OK, < 0 otherwise.
 int PrintVideoFrame(const VideoFrame& frame, FILE* file);
+int PrintVideoFrame(const VideoFrameBuffer& frame, FILE* file);
 
 // Extract buffer from VideoFrame or VideoFrameBuffer (consecutive
 // planes, no stride)
@@ -102,7 +103,7 @@ int ConvertToI420(VideoType src_video_type,
                   int src_height,
                   size_t sample_size,
                   VideoRotation rotation,
-                  VideoFrame* dst_frame);
+                  I420Buffer* dst_buffer);
 
 // Convert From I420
 // Input:
@@ -120,8 +121,12 @@ int ConvertFromI420(const VideoFrame& src_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