PerformanceMonitor: UMA alert for high browser CPU usage.

chrome/browser/performance_monitor/event_type.h

Index: chrome/browser/performance_monitor/event_type.h
diff --git a/chrome/browser/performance_monitor/event_type.h b/chrome/browser/performance_monitor/event_type.h
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+// Copyright 2013 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_PERFORMANCE_MONITOR_EVENT_TYPE_H_
+#define CHROME_BROWSER_PERFORMANCE_MONITOR_EVENT_TYPE_H_
+
+namespace performance_monitor {
+
+// IMPORTANT: To add new events, please
+// - Place the new event above EVENT_NUMBER_OF_EVENTS.
+// - Add a member to the EventKeyChar enum in key_builder.cc.
+// - Add the appropriate messages in generated_resources.grd.
+// - Add the appropriate functions in
+//   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,
+
+  // 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_RENDERER_KILLED,
+
+  // Chrome did not shut down correctly.
+  EVENT_UNCLEAN_EXIT,
+
+  EVENT_NUMBER_OF_EVENTS
+};
+
+}  // namespace performance_monitor
+
+#endif  // CHROME_BROWSER_PERFORMANCE_MONITOR_EVENT_TYPE_H_