Add Origin Power Map to Store Battery Auditing Data.

components/power/origin_power_map.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 COMPONENTS_POWER_ORIGIN_POWER_MAP_H_
+#define COMPONENTS_POWER_ORIGIN_POWER_MAP_H_
+
+#include <map>
+
+#include "components/keyed_service/core/keyed_service.h"
+#include "url/gurl.h"
+
+namespace power {
+
+// Tracks app and website origins and how much power they are consuming while
+// running.
+class OriginPowerMap : public KeyedService {
+ public:
+  typedef std::map<GURL, int> PercentOriginMap;
+
+  OriginPowerMap();
+  virtual ~OriginPowerMap();
+
+  // Returns the integer percentage usage of the total power consumed by a
+  // given URL's origin.
+  int GetPowerForOrigin(const GURL& url);
+
+  // Adds a certain amount of power consumption to a given URL's origin.
+  // |power| is a platform-specific heuristic estimating power consumption.
+  void AddPowerForOrigin(const GURL& url, double power);
+
+  // Returns a map of all origins to the integer percentage usage of power
+  // consumed.
+  PercentOriginMap GetPercentOriginMap();
+
+ private:
+  // OriginMap maps a URL to the platform specific metric of power consumed.

[Daniel Erat, 2014/08/12 18:40:18]

could you be more specific about how these values relate to total_consumed_ in
particular? for example:

// OriginMap maps a URL to the amount of power consumed by
// that URL using the same units as |total_consumed_|.
typedef ...

// Total amount of power consumed using opaque platform-specific
// units.
double total_consumed_;

[Daniel Nishi, 2014/08/12 19:57:34]

I've upped the comments.

+  typedef std::map<GURL, double> OriginMap;
+  OriginMap origin_map_;
+
+  // The total amount of power consumed since the last wipe.
+  double total_consumed_;
+
+  DISALLOW_COPY_AND_ASSIGN(OriginPowerMap);
+};
+
+}  // namespace power
+
+#endif  // COMPONENTS_POWER_ORIGIN_POWER_MAP_H_