Fix a bug in VideoRendererImpl in scaling

chrome/renderer/media/video_renderer_impl.cc

 // Copyright (c) 2009 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 "chrome/renderer/media/video_renderer_impl.h"
 #include "media/base/yuv_convert.h"
 
 VideoRendererImpl::VideoRendererImpl(WebMediaPlayerDelegateImpl* delegate)
     : delegate_(delegate),
       last_converted_frame_(NULL) {
@@ skipping 24 matching lines @@
   GetCurrentFrame(&video_frame);
   if (video_frame.get()) {
     CopyToCurrentFrame(video_frame);
     video_frame = NULL;
   }
   SkMatrix matrix;
   matrix.setTranslate(static_cast<SkScalar>(dest_rect.x()),
                       static_cast<SkScalar>(dest_rect.y()));
   if (dest_rect.width()  != video_size_.width() ||
       dest_rect.height() != video_size_.height()) {
-    matrix.preScale(
-        static_cast<SkScalar>(dest_rect.width()  / video_size_.width()),
-        static_cast<SkScalar>(dest_rect.height() / video_size_.height()));
+    matrix.preScale(SkIntToScalar(dest_rect.width()) /
+                    SkIntToScalar(video_size_.width()),
+                    SkIntToScalar(dest_rect.height()) /
+                    SkIntToScalar(video_size_.height()));
   }
   canvas->drawBitmapMatrix(bitmap_, matrix, NULL);
 }
 
 void VideoRendererImpl::CopyToCurrentFrame(media::VideoFrame* video_frame) {
   base::TimeDelta timestamp = video_frame->GetTimestamp();
   if (video_frame != last_converted_frame_ ||
       timestamp != last_converted_timestamp_) {
     last_converted_frame_ = video_frame;
     last_converted_timestamp_ = timestamp;
@@ skipping 14 matching lines @@
                                 frame_in.strides[media::VideoSurface::kYPlane],
                                 frame_in.strides[media::VideoSurface::kUPlane],
                                 bitmap_.rowBytes());
       bitmap_.unlockPixels();
       video_frame->Unlock();
     } else {
       NOTREACHED();
     }
   }
 }