DevTools: introduce RecordEnumeratedHistogram method.

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 RenderProcessHost;
 
@@ skipping 20 matching lines @@
   RWH_SYNTHETIC_GESTURE,
   RWH_FOCUS,
   RWH_BLUR,
   RWH_SHARED_BITMAP,
   RWH_BAD_ACK_MESSAGE,
   RWHVA_SHARED_MEMORY,
   SERVICE_WORKER_BAD_URL,
   WC_INVALID_FRAME_SOURCE,
   RWHVM_UNEXPECTED_FRAME_TYPE,
   RFPH_DETACH,
+  DFH_BAD_EMBEDDER_MESSAGE,
   // 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.
 // Logs the event, records a histogram metric for the |reason|, and terminates
 // the process for |host|.
 void ReceivedBadMessage(RenderProcessHost* host, BadMessageReason reason);
 
 }  // namespace bad_message
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_BAD_MESSAGE_H_