[chromeos] New PowerManagerClient observer to collect power data.

chromeos/dbus/power_data_collector.cc

+// 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.
+
+#include "base/time/time.h"
+#include "chromeos/dbus/power_data_collector.h"
+#include "chromeos/dbus/power_manager/power_supply_properties.pb.h"
+
+namespace chromeos {
+
+PowerDataCollector::PowerDataCollector(PowerManagerClient* pm_client)
+    : pm_client_(pm_client) {

[stevenjb, 2013/12/04 00:51:47]

This should just set
pm_client_(DBusThreadManager::Get()->GetPowerManagerClient())

+  power_supply_.reset(new std::vector<PowerSupplySnapshot>);
+  pm_client_->AddObserver(this);

[stevenjb, 2013/12/04 00:51:47]

Probably want to call pm_client_->RequestStatusUpdate();

+}
+
+void PowerDataCollector::PowerChanged(
+    const power_manager::PowerSupplyProperties& prop) {
+  base::Time now = base::Time::NowFromSystemTime();
+
+  PowerSupplySnapshot snapshot = {
+    now.ToInternalValue(),
+    prop.external_power() != power_manager::PowerSupplyProperties::DISCONNECTED,
+    prop.battery_percent()};
+
+  power_supply_->push_back(snapshot);
+}
+
+PowerDataCollector::~PowerDataCollector() {

[stevenjb, 2013/12/04 00:51:47]

Should follow constructor

+  pm_client_->RemoveObserver(this);
+}
+
+}  // namespace chromeos