Serialize PictureLayer properties.

blimp/common/proto/tab_control.proto

 // Copyright 2015 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.
 //
 // Message definitions for browser tab control messages.
 
 syntax = "proto2";
 
 option optimize_for = LITE_RUNTIME;
 
@@ skipping 10 matching lines @@
     CLOSE_TAB = 2;
 
     // Client => Server types.
     SIZE = 3;
   }
 
   optional Type type = 1;
 
   // Feature-specific messages follow.
   // Only one of these fields may be set per TabControlMessage.
-  // TODO(kmarshall): use a 'oneof' union when it's supported in Chromium.
+  // TODO(kmarshall): use a 'oneof' union when it's supported in Chromium.  See
+  // crbug.com/570371.
   optional SizeMessage size = 1000;
 }