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

device/generic_sensor/platform_sensor_utils_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_PLATFORM_SENSOR_UTILS_IIO_H_
+#define DEVICE_GENERIC_SENSOR_PLATFORM_SENSOR_UTILS_IIO_H_
+
+#include "base/files/file_path.h"
+#include "device/generic_sensor/public/interfaces/sensor.mojom.h"
+
+namespace device {
+
+class SensorReader {

[Mikhail, 2016/10/11 14:46:47]

how is that different to ambient_light_reader_iio.h  ?

+ public:
+  static std::unique_ptr<SensorReader> Create(mojom::SensorType type);
+
+  bool ReadSensorValue(double* lux);
+
+  mojom::SensorType type() const;
+
+ private:
+  SensorReader(mojom::SensorType type,
+               std::vector<base::FilePath> sensor_paths);

[Mikhail, 2016/10/11 14:46:47]

pass vector as const ref

+
+  const mojom::SensorType type_;
+  const std::vector<base::FilePath> sensor_paths_;
+
+  DISALLOW_COPY_AND_ASSIGN(SensorReader);
+};
+
+}  // device
+
+#endif  // DEVICE_GENERIC_SENSOR_PLATFORM_SENSOR_UTILS_IIO_H_