Add in a new FrameConsumer interface, Decode API, and a RectangleUpdateDecoder abstraction.

remoting/base/protocol/chromotocol.proto

 // Copyright (c) 2010 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.
 //
 // Protocol for communication between chromoting client and host.
 
 syntax = "proto2";
 
 option optimize_for = LITE_RUNTIME;
 
@@ skipping 120 matching lines @@
   enum Flags {
     FIRST_PACKET = 1;
     LAST_PACKET = 2;
   }
   optional int32 flags = 1 [default = 0];
 
   // The sequence number of the partial data for updating a rectangle.
   optional int32 sequence_number = 2 [default = 0];
 
   // This is provided on the first packet of the rectangle data, when
-  // the sequence_number is 0.
+  // the flags has FIRST_PACKET set.
   optional RectangleFormat format = 3;
 
   optional bytes encoded_rect = 4;
 }
 
 // Defines the message that is sent from the host to the client.
 // Only one of these messages should be present.
 // NEXT ID: 5
 message ChromotingHostMessage {
   optional InitClientMessage init_client= 1;
@@ skipping 64 matching lines @@
 // Only one of the optional messages should be present.
 // NEXT ID: 7
 message ChromotingClientMessage {
   optional KeyEvent key_event = 1;
   optional MouseSetPositionEvent mouse_set_position_event = 2;
   optional MouseMoveEvent mouse_move_event = 3;
   optional MouseWheelEvent mouse_wheel_event = 4;
   optional MouseDownEvent mouse_down_event = 5;
   optional MouseUpEvent mouse_up_event = 6;
 }