Generic Sensor API : Ambient Light Sensor API.

device/sensor/sensor_manager.h

Index: device/sensor/sensor_manager.h
diff --git a/device/sensor/sensor_manager.h b/device/sensor/sensor_manager.h
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+// Copyright 2016 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 DEVICE_SENSOR_SENSOR_MANAGER_H_
+#define DEVICE_SENSOR_SENSOR_MANAGER_H_
+
+#include "base/memory/scoped_ptr.h"
+#include "device/sensor/sensor_service.h"
+
+namespace device {
+
+// Platform specific manager class for fetching sensor data (as of now only
+// ALS).
+class SensorManager {
+ public:
+  // Creates a SensorManager object. |callback| should be called when the
+  // ALS reading changes.
+  static scoped_ptr<SensorManager> Create(
+      const SensorService::SensorUpdateCallback& callback);
+
+  virtual ~SensorManager() {}
+
+  // Start listening for sensor reading changes. New updates are signalled
+  // by invoking the callback provided at construction time.
+  // Note that this is called in the IO thread.
+  virtual bool StartListeningSensorChange() = 0;
+
+  // Stop listening for sensor reading changes.
+  // Note that this is called in the IO thread.
+  virtual void StopListeningSensorChange() = 0;
+};
+
+}  // namespace device
+
+#endif  // DEVICE_SENSOR_SENSOR_MANAGER_H_