Fix CPM casting issue; refactor renderer crash events

chrome/browser/performance_monitor/event.h

Index: chrome/browser/performance_monitor/event.h
diff --git a/chrome/browser/performance_monitor/event.h b/chrome/browser/performance_monitor/event.h
index c2c266b5ff57f250d87e0675d987a3fb1cb4947a..1dbbe3b4e247d78f6da886227c64e87e914e4afd 100644
--- a/chrome/browser/performance_monitor/event.h
+++ b/chrome/browser/performance_monitor/event.h
@@ -19,16 +19,27 @@ namespace performance_monitor {
 //   chrome/browser/ui/webui/performance_monitor/performance_monitor_l10n.h.
 enum EventType {
   EVENT_UNDEFINED,
+
+  // Extension-Related events
   EVENT_EXTENSION_INSTALL,
   EVENT_EXTENSION_UNINSTALL,
   EVENT_EXTENSION_UPDATE,
   EVENT_EXTENSION_ENABLE,
   EVENT_EXTENSION_DISABLE,
+
+  // Chrome's version has changed.
   EVENT_CHROME_UPDATE,
-  EVENT_RENDERER_FREEZE,
+
+  // Renderer-Failure related events; these correspond to the RENDERER_HANG
+  // event, and the two termination statuses ABNORMAL_EXIT and PROCESS_KILLED,
+  // respectively.
+  EVENT_RENDERER_HANG,
   EVENT_RENDERER_CRASH,
-  EVENT_KILLED_BY_OS_CRASH,
+  EVENT_RENDERER_KILLED,
+
+  // Chrome did not shut down correctly.
   EVENT_UNCLEAN_EXIT,
+
   EVENT_NUMBER_OF_EVENTS
 };