Add DPI information to video packets.

remoting/proto/video.proto

 // 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.
 
 // Protocol for video messages.
 
 syntax = "proto2";
 
 option optimize_for = LITE_RUNTIME;
 
@@ skipping 15 matching lines @@
   // Width, height (in screen pixels) for this update.
   optional int32 width = 3;
   optional int32 height = 4;
 
   // The encoding used for this image update.
   optional Encoding encoding = 5 [default = ENCODING_INVALID];
   
   // Width and height of the whole screen.
   optional int32 screen_width = 6;
   optional int32 screen_height = 7;
+
+  // Horizontal and vertical DPI of the screen. If either of these is zero or
+  // unset, the corresponding DPI should be assumed to be 96 (Windows' default)
+  optional int32 x_dpi = 8;
+  optional int32 y_dpi = 9;
 }
 
 // TODO(hclam): Remove this message once we can obtain dirty rects from libvpx.
 message Rect {
   optional int32 x = 1;
   optional int32 y = 2;
   optional int32 width = 3;
   optional int32 height = 4;
 }
 
@@ skipping 42 matching lines @@
   // Time in milliseconds spent in capturing this video frame.
   optional int32 capture_time_ms = 7;
 
   // Time in milliseconds spent in encoding this video frame.
   optional int32 encode_time_ms = 8;
 
   // The most recent sequence number received from the client on the event
   // channel.
   optional int64 client_sequence_number = 9;
 }