Extend VideoControl to allow clients to request lossless modes.

remoting/codec/video_encoder.h

Index: remoting/codec/video_encoder.h
diff --git a/remoting/codec/video_encoder.h b/remoting/codec/video_encoder.h
index f0f8a2fc27d4a4091f8867b00241bac7c3768cbd..f497eb3b4c3839b6acad5a7968d35f70c2ee8d04 100644
--- a/remoting/codec/video_encoder.h
+++ b/remoting/codec/video_encoder.h
@@ -21,6 +21,10 @@ 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;
 };