Copy the (early prototype of) remoting in Chrome into the public tree....

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;
+
+package chromotocol_pb;
+
+// A message that gets sent to the client after the client is connected to the
+// host. It contains information that the client needs to know about the host.
+// NEXT ID: 3
+message InitClientMessage {
+  required int32 width = 1;
+  required int32 height = 2;
+}
+
+// A message to denote the beginning of an update stream. It will be followed
+// by 0 or more PartialUpdateStream messages and then a EndUpdateStream message.
+// NEXT ID: 1
+message BeginUpdateStreamMessage {
+}
+
+// A message to denote the end of an update stream.
+// NEXT ID: 1
+message EndUpdateStreamMessage {
+}
+
+// Identifies how the image was encoded.
+enum UpdateStreamEncoding {
+  EncodingNone = 0;
+  EncodingZlib = 1;
+}
+
+// Identifies the pixel format.
+// Note that this list should match exactly the same as
+// media::VideoFrame::Format in media/base/video_frame.h.
+enum PixelFormat {
+  PixelFormatInvalid = 0;
+  PixelFormatRgb555 = 1;
+  PixelFormatRgb565 = 2;
+  PixelFormatRgb24 = 3;
+  PixelFormatRgb32 = 4;
+  PixelFormatRgba = 5;
+  PixelFormatYv12 = 6;
+  PixelFormatYv16 = 7;
+  PixelFormatEmpty = 8;
+  PixelFormatAscii = 9;
+}
+
+// A message with info about the update stream.
+// NEXT ID: 6
+message UpdateStreamPacketHeader {
+  // X,Y coordinates (in screen pixels) for origin of this update.
+  required int32 x = 1;
+  required int32 y = 2;
+
+  // Width, height (in screen pixels) for this update.
+  required int32 width = 3;
+  required int32 height = 4;
+
+  // The encoding used for this image update.
+  optional UpdateStreamEncoding encoding = 5 [default=EncodingNone];
+
+  // The pixel format of this image.
+  optional PixelFormat pixel_format = 6 [default=PixelFormatRgb24];
+}
+
+// A message to denote a partial update stream.
+// NEXT ID: 3
+message UpdateStreamPacketMessage {
+  // TODO(garykac): Make this required and fix unit tests.
+  optional UpdateStreamPacketHeader header = 2;
+  optional bytes data = 1;
+}
+
+// Defines the message that is sent from the host to the client.
+// Only one of these messages should be present.
+// NEXT ID: 5
+message HostMessage {
+  optional InitClientMessage init_client= 1;
+  optional BeginUpdateStreamMessage begin_update_stream = 2;
+  optional EndUpdateStreamMessage end_update_stream = 3;
+  optional UpdateStreamPacketMessage update_stream_packet = 4;
+}
+
+// Defines a keyboard event.
+// NEXT ID: 3
+message KeyEvent {
+  // The POSIX key code.
+  required int32 key = 1;
+  required bool pressed = 2;
+}
+
+// Sets the position of the mouse cursor.
+// The coordinate value is between [0 .. 1] which is relative to the
+// dimension of the screen area.
+// NEXT ID: 3
+message MouseSetPositionEvent {
+  required float x = 1;
+  required float y = 2;
+}
+
+// Adjust the position of the mouse cursor by an offset.
+// NEXT ID: 3
+message MouseMoveEvent {
+  required int32 offset_x = 1;
+  required int32 offset_y = 2;
+}
+
+// Motion of the mouse wheel.
+// NEXT ID: 3
+message MouseWheelEvent {
+  required int32 offset_x = 1;
+  required int32 offset_y = 2;
+}
+
+// Mouse button is pressed down.
+// NEXT ID: 2
+message MouseDownEvent {
+  enum Button {
+    LEFT = 0;
+    MIDDLE = 1;
+    RIGHT = 2;
+  }
+  required Button button = 1;
+}
+
+// Mouse button is released.
+// NEXT ID: 2
+message MouseUpEvent {
+  enum Button {
+    LEFT = 0;
+    MIDDLE = 1;
+    RIGHT = 2;
+  }
+  required Button button = 1;
+}
+
+// Defines the message that is sent from the client to the host.
+// Only one of these messages should be present.
+// NEXT ID: 7
+message ClientMessage {
+  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;
+}