Histograms.xml python script housekeeping

chrome/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 CHROME_BROWSER_BAD_MESSAGE_H_
 #define CHROME_BROWSER_BAD_MESSAGE_H_
 
 namespace content {
 class BrowserMessageFilter;
 class RenderProcessHost;
 }
 
 namespace chrome {
 namespace bad_message {
 
 // The browser process often chooses to terminate a renderer if it receives
 // a bad IPC message. The reasons are tracked for metrics.
 //
 // See also content/browser/bad_message.h.
 //
 // NOTE: Do not remove or reorder elements in this list. Add new entries at the
 // end. Items may be renamed but do not change the values. We rely on the enum
-// values in histograms. Also update histograms.xml with any new values.
+// values in histograms. Also update histograms.xml with any new values by
+// running:
+//    python tools/metrics/histograms/update_bad_message_reasons.py
 enum BadMessageReason {
   WRLHH_LOGGING_STOPPED_BAD_STATE = 0,
 
   // Please add new elements here. The naming convention is abbreviated class
   // name (e.g. RenderFrameHost becomes RFH) plus a unique description of the
   // reason.
   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(content::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(content::BrowserMessageFilter* filter,
                         BadMessageReason reason);
 
 }  // namespace bad_message
 }  // namespace chrome
 
 #endif  // CHROME_BROWSER_BAD_MESSAGE_H_