Chromoting to report roundtrip latency

remoting/proto/video.proto

Index: remoting/proto/video.proto
diff --git a/remoting/proto/video.proto b/remoting/proto/video.proto
index b9bd53c784ee8ef88ca24be64ce329c40d10d6d0..049351e07ae60c94f0bd67f1d49d5cd7c3b04b28 100644
--- a/remoting/proto/video.proto
+++ b/remoting/proto/video.proto
@@ -1,4 +1,4 @@
-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Copyright (c) 2011 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.
 
@@ -91,4 +91,8 @@ message VideoPacket {
 
   // 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;
 }