Refactor scaling.

webrtc/media/base/videoframefactory.cc

Index: webrtc/media/base/videoframefactory.cc
diff --git a/webrtc/media/base/videoframefactory.cc b/webrtc/media/base/videoframefactory.cc
index 0a7dfc22d494a674c70899e425dc7ce1d55acc43..41063cd72654436dac96c910ff97d120703b3905 100644
--- a/webrtc/media/base/videoframefactory.cc
+++ b/webrtc/media/base/videoframefactory.cc
@@ -39,13 +39,12 @@ VideoFrame* VideoFrameFactory::CreateAliasedFrame(
     std::swap(output_width, output_height);
   }
 
-  std::unique_ptr<VideoFrame> output_frame(new WebRtcVideoFrame(
-      pool_.CreateBuffer(output_width, output_height),
-      cropped_input_frame->rotation(),
-      cropped_input_frame->timestamp_us()));
+  rtc::scoped_refptr<webrtc::I420Buffer> scaled =
+      pool_.CreateBuffer(output_width, output_height);
+  scaled->CropAndScale(cropped_input_frame->video_frame_buffer());
 
-  cropped_input_frame->StretchToFrame(output_frame.get(), true, true);
-  return output_frame.release();
+  return new WebRtcVideoFrame(scaled, cropped_input_frame->rotation(),
+                              cropped_input_frame->timestamp_us());
 }
 
 }  // namespace cricket