sync compositor: Reduce begin frame sync IPC overhead

content/browser/bad_message.h

 // 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.
 
 #ifndef CONTENT_BROWSER_BAD_MESSAGE_H_
 #define CONTENT_BROWSER_BAD_MESSAGE_H_
 
 namespace content {
 class BrowserMessageFilter;
 class RenderProcessHost;
@@ skipping 136 matching lines @@
   NI_IN_PAGE_NAVIGATION = 122,
   RPH_MOJO_PROCESS_ERROR = 123,
   DBMF_INVALID_ORIGIN_ON_GET_SPACE = 124,
   DBMF_INVALID_ORIGIN_ON_MODIFIED = 125,
   DBMF_INVALID_ORIGIN_ON_CLOSED = 126,
   WSH_INVALID_HEADER_VALUE = 127,
   SWDH_SET_HOSTED_VERSION_INVALID_HOST = 128,
   SWDH_SET_HOSTED_VERSION_PROCESS_MISMATCH = 129,
   MSDH_INVALID_FRAME_ID = 130,
   SDH_INVALID_PORT_RANGE = 131,
+  SCO_INVALID_ARGUMENT = 132,
 
   // Please add new elements here. The naming convention is abbreviated class
   // name (e.g. RenderFrameHost becomes RFH) plus a unique description of the
   // reason. After making changes, you MUST update histograms.xml by running:
   // "python tools/metrics/histograms/update_bad_message_reasons.py"
   BAD_MESSAGE_MAX
 };
 
 // Called when the browser receives a bad IPC message from a renderer process on
 // the UI thread. Logs the event, records a histogram metric for the |reason|,
 // and terminates the process for |host|.
 void ReceivedBadMessage(RenderProcessHost* host, BadMessageReason reason);
 
 // Called when a browser message filter receives a bad IPC message from a
 // renderer or other child process. Logs the event, records a histogram metric
 // for the |reason|, and terminates the process for |filter|.
 void ReceivedBadMessage(BrowserMessageFilter* filter, BadMessageReason reason);
 
 }  // namespace bad_message
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_BAD_MESSAGE_H_