New method CreateScaledFrame in the VideoFrameFactory interface.

webrtc/media/engine/webrtcvideoframefactory.h

Index: webrtc/media/engine/webrtcvideoframefactory.h
diff --git a/webrtc/media/engine/webrtcvideoframefactory.h b/webrtc/media/engine/webrtcvideoframefactory.h
index c1569969fb2fb677352755a8fb10eeba8c844b4a..8425cab29b4b43fda265355d3af530ca6fdfc432 100644
--- a/webrtc/media/engine/webrtcvideoframefactory.h
+++ b/webrtc/media/engine/webrtcvideoframefactory.h
@@ -20,6 +20,11 @@ struct CapturedFrame;
 // Creates instances of cricket::WebRtcVideoFrame.
 class WebRtcVideoFrameFactory : public VideoFrameFactory {
  public:
+  std::unique_ptr<VideoFrame> CreateScaledFrame(
+      const CapturedFrame* input_frame,
+      int width,
+      int height) const override;
+
   VideoFrame* CreateAliasedFrame(const CapturedFrame* aliased_frame,
                                  int width,
                                  int height) const override;