Remove redundant I420-to-YV12 conversion in MediaStreamVideoTrack.

content/renderer/media/webmediaplayer_ms.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/renderer/media/webmediaplayer_ms.h"
 
 #include <limits>
 
 #include "base/bind.h"
 #include "base/callback.h"
@@ skipping 23 matching lines @@
 using blink::WebRect;
 using blink::WebSize;
 
 namespace {
 
 // This function copies a YV12 or NATIVE_TEXTURE to a new YV12
 // media::VideoFrame.
 scoped_refptr<media::VideoFrame> CopyFrameToYV12(
     const scoped_refptr<media::VideoFrame>& frame) {
   DCHECK(frame->format() == media::VideoFrame::YV12 ||
+         frame->format() == media::VideoFrame::I420 ||
          frame->format() == media::VideoFrame::NATIVE_TEXTURE);
   scoped_refptr<media::VideoFrame> new_frame =
       media::VideoFrame::CreateFrame(media::VideoFrame::YV12,
                                      frame->coded_size(),
                                      frame->visible_rect(),
                                      frame->natural_size(),
                                      frame->GetTimestamp());
 
   if (frame->format() == media::VideoFrame::NATIVE_TEXTURE) {
     SkBitmap bitmap;
@@ skipping 419 matching lines @@
   GetClient()->readyStateChanged();
 }
 
 blink::WebMediaPlayerClient* WebMediaPlayerMS::GetClient() {
   DCHECK(thread_checker_.CalledOnValidThread());
   DCHECK(client_);
   return client_;
 }
 
 }  // namespace content