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diff --git a/chrome/browser/performance_monitor/event.h b/chrome/browser/performance_monitor/event.h
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+++ b/chrome/browser/performance_monitor/event.h
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+// 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.
+
+#ifndef CHROME_BROWSER_PERFORMANCE_MONITOR_EVENT_H_
+#define CHROME_BROWSER_PERFORMANCE_MONITOR_EVENT_H_
+
+#include "base/values.h"
+#include "base/time.h"
+#include "base/memory/scoped_ptr.h"
+
+namespace performance_monitor {
+
+// IMPORTANT: This is used as an indication of the event type within the
+// performance monitor database; do not change the order! If you add new events
+// to this list, place them above EVENT_NUMBER_OF_EVENTS.
+enum EventType {
+  EVENT_UNDEFINED,
+  EVENT_EXTENSION_INSTALL,
+  EVENT_EXTENSION_UNINSTALL,
+  EVENT_EXTENSION_UPDATE,
+  EVENT_EXTENSION_ENABLE,
+  EVENT_EXTENSION_UNLOAD,
+  EVENT_CHROME_UPDATE,
+  EVENT_RENDERER_FREEZE,
+  EVENT_RENDERER_CRASH,
+  EVENT_OOM_CRASH,
+  EVENT_UNCLEAN_SHUTDOWN,
+  EVENT_NUMBER_OF_EVENTS
+};
+
+// The wrapper class for the JSON-generated event classes for the performance
+// monitor. This class is used so we can pass around events in a single class,
+// rather than having a variety of different types (since JSON does not
+// currently support inheritance). Since the class will occasionally need to
+// be compared against other events, we construct it with type and time. Other
+// information should not be needed commonly, and is stored in a JSON-generated
+// DictionaryValue.
+class Event {
+ public:
+  Event(const EventType& type,
+        const base::Time& time,
+        scoped_ptr<base::DictionaryValue> data);
+  virtual ~Event();
+
+  // Construct an event from the given DictionaryValue; takes ownership of
+  // |data|.
+  static scoped_ptr<Event> FromValue(scoped_ptr<base::DictionaryValue> data);
+
+  // Accessors
+  EventType type() const { return type_; }
+  base::Time time() const { return time_; }
+  base::DictionaryValue* data() const { return data_.get(); }
+
+ private:
+
+  // The type of the event.
+  EventType type_;
+  // The time at which the event was recorded.
+  base::Time time_;
+  // The full JSON-generated value representing the information of the event;
+  // these data are described in chrome/browser/performance_monitor/events.json.
+  scoped_ptr<base::DictionaryValue> data_;
+};
+
+}  // namespace performance_monitor
+
+#endif  // CHROME_BROWSER_PERFORMANCE_MONITOR_EVENT_H_