DeviceOrientation API on ChromeOS

ash/accelerometer/sensor_manager_delegate_chromeos.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 ASH_ACCELEROMETER_SENSOR_MANAGER_DELEGATE_CHROMEOS_H_
+#define ASH_ACCELEROMETER_SENSOR_MANAGER_DELEGATE_CHROMEOS_H_
+
+#include "content/public/browser/sensor_manager_delegate.h"
+
+#include "ash/accelerometer/accelerometer_observer.h"
+#include "base/callback.h"
+#include "base/macros.h"
+
+namespace ash {
+
+// Chrome OS implementation of the Device Orientation API. Responsible for
+// observing accelerometer events, and notifying content::SensorManagerChromeOS.
+class SensorManagerDelegateChromeOS : public AccelerometerObserver,
+                                      public content::SensorManagerDelegate {
+ public:
+  SensorManagerDelegateChromeOS();
+  ~SensorManagerDelegateChromeOS() override;
+
+  // AccelerometerObserver:
+  void OnAccelerometerUpdated(const ui::AccelerometerUpdate& update) override;
+
+  // content::SensorManagerDelegate:
+  void StartFetchingDeviceOrientationData(
+      const base::Callback<void(double, double, double)>& callback) override;
+  void StopFetchingDeviceOrientationData() override;
+
+ private:
+  // Callback to direct accelerometer events to.
+  base::Callback<void(double, double, double)> orientation_callback_;
+
+  // True if actively observing events.
+  bool observing_accelerometer_;

[flackr, 2014/11/13 00:07:34]

This should be the same as orientation_callback_.is_null() shouldn't it?

[jonross, 2014/11/13 01:34:05]

Done.

+
+  DISALLOW_COPY_AND_ASSIGN(SensorManagerDelegateChromeOS);
+};
+
+}  // namespace ash
+
+#endif  // ASH_ACCELEROMETER_SENSOR_MANAGER_DELEGATE_CHROMEOS_H_