Implement VP9/I444 encode support in the Chromoting host.

remoting/base/util.h

Index: remoting/base/util.h
diff --git a/remoting/base/util.h b/remoting/base/util.h
index c8c70210f686051ee474ffe0fbfe6931a2da6ebe..2546221ad46baa42cf3cecf5e6d1ca5206f3c92a 100644
--- a/remoting/base/util.h
+++ b/remoting/base/util.h
@@ -50,19 +50,6 @@ void ConvertAndScaleYUVToRGB32Rect(
     const webrtc::DesktopRect& dest_buffer_rect,
     const webrtc::DesktopRect& dest_rect);
 
-// Convert RGB32 to YUV on a specific rectangle.
-void ConvertRGB32ToYUVWithRect(const uint8* rgb_plane,
-                               uint8* y_plane,
-                               uint8* u_plane,
-                               uint8* v_plane,
-                               int x,
-                               int y,
-                               int width,
-                               int height,
-                               int rgb_stride,
-                               int y_stride,
-                               int uv_stride);
-
 int RoundToTwosMultiple(int x);
 
 // Align the sides of the rectangle to multiples of 2 (expanding outwards).