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

device/generic_sensor/platform_sensor_provider_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_PROVIDER_MAC_H_
+#define DEVICE_GENERIC_SENSOR_PLATFORM_SENSOR_PROVIDER_MAC_H_
+
+#include "device/generic_sensor/platform_sensor_provider.h"
+
+namespace device {
+
+class SensorsPollingThreadMac;
+
+class PlatformSensorProviderMac : public PlatformSensorProvider {
+ public:
+  PlatformSensorProviderMac();
+  ~PlatformSensorProviderMac() override;
+
+  static PlatformSensorProviderMac* GetInstance();
+  void BeginPollingSensor(PlatformSensor* sensor,

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

this is not smth Provider should do (it's just a factory)

Can we instead pass polling thread to PlatformSensorMac (e.g. as a task runner
instance) ?

+                          const PlatformSensorConfiguration& configuration);
+  void StopPollingSensor(PlatformSensor* sensor);
+
+ protected:
+  scoped_refptr<PlatformSensor> CreateSensorInternal(
+      mojom::SensorType type,
+      mojo::ScopedSharedBufferMapping mapping,
+      uint64_t buffer_size) override;
+
+ private:
+  std::unique_ptr<SensorsPollingThreadMac> polling_thread_;
+  DISALLOW_COPY_AND_ASSIGN(PlatformSensorProviderMac);
+};
+
+}  // namespace device
+
+#endif  // DEVICE_GENERIC_SENSOR_PLATFORM_SENSOR_PROVIDER_MAC_H_