[sensors] Ambient light sensor implementation for ChromeOS and Linux.

device/generic_sensor/ambient_light_reader_iio.h

+// 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_GENERIC_SENSOR_AMBIENT_LIGHT_READER_IIO_H_
+#define DEVICE_GENERIC_SENSOR_AMBIENT_LIGHT_READER_IIO_H_
+
+#include "base/files/file_path.h"
+
+namespace device {
+
+// Provides an interface to retrieve ambient light data from
+// an ambient light sensor.
+class AmbientLightSensorReaderIio {
+ public:
+  AmbientLightSensorReaderIio();
+  ~AmbientLightSensorReaderIio();
+
+  bool ReadSensorLuxValue(double* lux);
+  bool DetectLightSensor();
+
+ private:
+  base::FilePath sensor_path_;
+
+  DISALLOW_COPY_AND_ASSIGN(AmbientLightSensorReaderIio);
+};
+
+}  // namespace content
+
+#endif  // DEVICE_GENERIC_SENSOR_AMBIENT_LIGHT_READER_IIO_H_