Extend VideoControl to allow clients to request lossless modes.

remoting/codec/video_encoder.h

 // Copyright (c) 2012 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.
 
 #ifndef REMOTING_CODEC_VIDEO_ENCODER_H_
 #define REMOTING_CODEC_VIDEO_ENCODER_H_
 
 #include "base/memory/scoped_ptr.h"
 
 namespace webrtc {
 class DesktopFrame;
 }  // namespace webrtc
 
 namespace remoting {
 
 class VideoPacket;
 
 // A class to perform the task of encoding a continuous stream of images. The
 // interface is asynchronous to enable maximum throughput.
 class VideoEncoder {
  public:
   virtual ~VideoEncoder() {}
 
+  // Request that the encoder provide lossless encoding, or color, if possible.
+  virtual void SetLosslessEncode(bool want_lossless) {}
+  virtual void SetLosslessColor(bool want_lossless) {}
+
   // Encode an image stored in |frame|.
   virtual scoped_ptr<VideoPacket> Encode(const webrtc::DesktopFrame& frame) = 0;
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_CODEC_VIDEO_ENCODER_H_