Fix CPM casting issue; refactor renderer crash events

chrome/browser/performance_monitor/events.json

 // Copyright (c) 2012 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.
 
 [
   {
     "namespace": "events",
     "types": [
       {
         "id": "ExtensionEvent",
@@ skipping 15 matching lines @@
         "type": "object",
         "description": "The event to describe an update to Chrome; this will be recognized on startup by a change in the version number.",
         "properties": {
           "eventType": {"type": "integer", "description": "The type of the event."},
           "time": {"type": "number", "description": "The time at which the event was recorded."},
           "previousVersion": {"type": "string", "description": "The string representation of the previous Chrome version."},
           "currentVersion": {"type": "string", "description": "The string representation of the current Chrome version."}
         }
       },
       {
-        "id": "RendererCrash",
+        "id": "RendererFailure",
         "type": "object",
-        "description": "The event to represent a renderer crash.",
+        "description": "The event to represent a renderer hanging, crashing, or being killed.",
         "properties": {
           "eventType": {"type": "integer", "description": "The type of the event."},
-          "time": {"type": "number", "description": "The time at which the event was recorded."}
+          "time": {"type": "number", "description": "The time at which the event was recorded."},
+          "url": {"type": "string", "description": "The url (or urls) associated with the renderer failure, if available (if unavailable, this is empty)."}
         }
       },
       {
-        "id": "RendererFreeze",
-        "type": "object",
-        "description": "The event to represent a frozen renderer (when the frozen tab popup comes up).",
-        "properties": {
-          "eventType": {"type": "integer", "description": "The type of the event."},
-          "time": {"type": "number", "description": "The time at which the event was recorded."},
-          "url": {"type": "string", "description": "The crash url."}
-        }
-      },
-      {
         "id": "UncleanExit",
         "type": "object",
         "description": "The event to represent an unclean exit.",
         "properties": {
           "eventType": {"type": "integer", "description": "The type of the event."},
           "time": {"type": "number", "description": "The time at which the event was recorded."},
           "profileName": {"type": "string", "description": "The name of the profile which shutdown uncleanly."}
         }
       }
     ]
   }
 ]