[chromeos] New PowerManagerClient observer to collect power data.

chromeos/dbus/power_data_collector.h

+// Copyright (c) 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 CHROMEOS_DBUS_POWER_DATA_COLLECTOR_H_
+#define CHROMEOS_DBUS_POWER_DATA_COLLECTOR_H_
+
+#include <vector>
+
+#include "base/memory/scoped_ptr.h"
+#include "chromeos/dbus/power_manager_client.h"
+
+namespace power_manager {
+class PowerSupplyProperties;
+}
+
+namespace chromeos {
+
+class PowerDataCollector : public PowerManagerClient::Observer {
+ public:
+  struct PowerSupplySnapshot {
+    // Generated by Time::ToInternalValue.
+    int64 time;
+
+    // true if connected to externel power at the time of the snapshot.
+    bool external_power;
+
+    // The battery charge as a percentage of full charge in range [0.0, 100.00].
+    double battery_charge;
+  };
+
+ public:
+  PowerDataCollector(PowerManagerClient* pm_client);
+  ~PowerDataCollector();
+
+  virtual void PowerChanged(const power_manager::PowerSupplyProperties& prop);
+
+  std::vector<PowerSupplySnapshot> *GetPowerSupplyData(void) const {
+    return power_supply_.get();
+  }
+
+ private:
+  PowerManagerClient* pm_client_;
+  scoped_ptr<std::vector<PowerSupplySnapshot> > power_supply_;
+
+  DISALLOW_COPY_AND_ASSIGN(PowerDataCollector);
+};
+
+}  // namespace chromeos
+
+#endif  // CHROMEOS_DBUS_POWER_DATA_COLLECTOR_H_