[sensors] Introduce Generic Sensor API interfaces

device/generic_sensor/sensor_impl.h

Index: device/generic_sensor/sensor_impl.h
diff --git a/device/generic_sensor/sensor_impl.h b/device/generic_sensor/sensor_impl.h
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+++ b/device/generic_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_GENERIC_SENSOR_SENSOR_IMPL_H_
+#define DEVICE_GENERIC_SENSOR_SENSOR_IMPL_H_
+
+#include "base/macros.h"
+#include "device/generic_sensor/platform_sensor.h"
+#include "device/generic_sensor/public/interfaces/sensor.mojom.h"
+#include "mojo/public/cpp/bindings/strong_binding.h"
+
+namespace device {
+
+// Implementation of Sensor mojo interface.
+// Instances of this class are created by SensorProviderImpl.
+class SensorImpl final : public mojom::Sensor, public PlatformSensor::Client {
+ public:
+  SensorImpl(mojo::InterfaceRequest<mojom::Sensor> request,
+             scoped_refptr<PlatformSensor> sensor);
+  ~SensorImpl() override;
+
+  mojom::SensorClientRequest GetClient();
+
+ private:
+  // Sensor implementation.
+  void AddConfiguration(const PlatformSensorConfiguration& configuration,
+                        const AddConfigurationCallback& callback) override;
+  void RemoveConfiguration(
+      const PlatformSensorConfiguration& configuration,
+      const RemoveConfigurationCallback& callback) override;
+  void Suspend() override;
+  void Resume() override;
+
+  // device::Sensor::Client implementation.
+  void OnSensorReadingChanged() override;
+  void OnSensorError() override;
+  bool IsNotificationSuspended() override;
+
+ private:
+  scoped_refptr<PlatformSensor> sensor_;
+  mojo::StrongBinding<Sensor> binding_;
+  mojom::SensorClientPtr client_;
+  bool suspended_;
+  DISALLOW_COPY_AND_ASSIGN(SensorImpl);
+};
+
+}  // namespace device
+
+#endif  // DEVICE_GENERIC_SENSOR_SENSOR_IMPL_H_