Chrome power profiler service

content/public/browser/power_profiler_observer.h

+// Copyright 2014 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_PUBLIC_BROWSER_POWER_PROFILER_OBSERVER_H_
+#define CONTENT_PUBLIC_BROWSER_POWER_PROFILER_OBSERVER_H_
+
+#include "base/basictypes.h"
+#include "base/memory/ref_counted.h"
+#include "content/common/content_export.h"
+#include "content/public/browser/power_data_provider.h"
+
+namespace content {
+
+// A class used to monitor the power usage and tell profiler the power data
+class CONTENT_EXPORT PowerProfilerObserver {
+ public:
+  enum Resolution {
+    LOW,
+    NORMAL,
+    HIGH,
+    TYPE_COUNT // this should be always the last one
+  };
+
+  PowerProfilerObserver();
+  ~PowerProfilerObserver();

[qsr, 2014/01/23 12:50:06]

Where is the implementation of those 2 methods? You probably want those inline
here. Moreover, please the destructor needs to be virtual.

[Pan, 2014/01/25 09:35:53]

Done.

+
+  // This method should be called on UI thread
+  virtual void OnPowerEvent(const PowerEvent&) = 0;
+
+  // This method compares resolution with derived class's requirements,
+  // and over-write resolution with the higher one.
+  virtual void GetHigherResolution(Resolution& resolution) = 0;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(PowerProfilerObserver);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_PUBLIC_BROWSER_POWER_PROFILER_OBSERVER_H_