Generic Sensor API : Ambient Light Sensor API.

device/sensor/sensor_impl.h

Index: device/sensor/sensor_impl.h
diff --git a/device/sensor/sensor_impl.h b/device/sensor/sensor_impl.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_IMPL_H_
+#define DEVICE_SENSOR_SENSOR_IMPL_H_
+
+#include <memory>
+
+#include "base/macros.h"
+#include "device/sensor/sensor.mojom.h"
+#include "device/sensor/sensor_export.h"
+#include "device/sensor/sensor_service.h"
+#include "mojo/public/cpp/bindings/strong_binding.h"
+
+namespace device {
+
+class SensorImpl : public AmbientLightSensor {
+ public:
+  DEVICE_SENSOR_EXPORT static void Create(
+      mojo::InterfaceRequest<AmbientLightSensor> request);
+
+ private:
+  typedef mojo::Callback<void(AmbientLightSensorReadingPtr)>
+      SensorReadingCallback;
+
+  explicit SensorImpl(mojo::InterfaceRequest<AmbientLightSensor> request);
+  ~SensorImpl() override;
+
+  // AmbientLightSensor interface methods.
+  void QueryNextReading(const SensorReadingCallback& callback) override;
+  void StartReading() override;
+  void StopReading() override;
+
+  void DidChange(const AmbientLightSensorReading& als_reading);
+  void ReportReading();
+
+  mojo::StrongBinding<AmbientLightSensor> binding_;
+  std::unique_ptr<SensorService::SensorUpdateSubscription> subscription_;
+  SensorReadingCallback callback_;
+  AmbientLightSensorReading reading_;
+  bool reading_to_report_;
+
+  DISALLOW_COPY_AND_ASSIGN(SensorImpl);
+};
+
+}  // namespace device
+
+#endif  // DEVICE_SENSOR_SENSOR_IMPL_H_