[sensors] [mac] Implement ambient light sensor for macOS

device/generic_sensor/platform_sensor_polling_mac.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_POLLING_MAC_H_
+#define DEVICE_GENERIC_SENSOR_PLATFORM_SENSOR_POLLING_MAC_H_

[Mikhail, 2016/09/13 09:27:35]

shouldn't file be named as platform_sensor_polling_thread_mac.h ?

+
+#include "base/threading/thread.h"
+#include "base/timer/timer.h"
+#include "device/generic_sensor/platform_sensor_mac.h"
+
+namespace device {
+
+class SensorsPollingThreadMac : public base::Thread {
+ public:
+  SensorsPollingThreadMac(const char* name);
+  ~SensorsPollingThreadMac() override;
+
+  void BeginPollingSensor(PlatformSensorMac* sensor,
+                          const PlatformSensorConfiguration& configuration);
+  void StopPollingSensor(PlatformSensorMac* sensor);
+
+ private:
+  using SensorsMap =
+      std::map<PlatformSensorMac*, std::unique_ptr<base::RepeatingTimer>>;

[Mikhail, 2016/09/13 09:27:35]

Think it would be better if 'PlatformSensorMac' itself contained a timer.

+  SensorsMap sensors_;
+
+  DISALLOW_COPY_AND_ASSIGN(SensorsPollingThreadMac);
+};
+
+}  // namespace device
+
+#endif  // DEVICE_GENERIC_SENSOR_PLATFORM_SENSOR_POLLING_MAC_H_