Revert of Move //device/generic_sensor to be part of the internal implementation of the Device Service.

services/device/generic_sensor/platform_sensor.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 SERVICES_DEVICE_GENERIC_SENSOR_PLATFORM_SENSOR_H_
-#define SERVICES_DEVICE_GENERIC_SENSOR_PLATFORM_SENSOR_H_
-
-#include <list>
-#include <map>
-
-#include "base/macros.h"
-#include "base/memory/ref_counted.h"
-#include "base/memory/weak_ptr.h"
-#include "base/observer_list.h"
-#include "base/single_thread_task_runner.h"
-#include "mojo/public/cpp/system/buffer.h"
-#include "services/device/public/cpp/generic_sensor/sensor_reading.h"
-#include "services/device/public/interfaces/sensor.mojom.h"
-
-namespace device {
-
-class PlatformSensorProvider;
-class PlatformSensorConfiguration;
-
-// Base class for the sensors provided by the platform. Concrete instances of
-// this class are created by platform specific PlatformSensorProvider.
-class PlatformSensor : public base::RefCountedThreadSafe<PlatformSensor> {
- public:
-  // The interface that must be implemented by PlatformSensor clients.
-  class Client {
-   public:
-    virtual void OnSensorReadingChanged() = 0;
-    virtual void OnSensorError() = 0;
-    virtual bool IsNotificationSuspended() = 0;
-
-   protected:
-    virtual ~Client() {}
-  };
-
-  virtual mojom::ReportingMode GetReportingMode() = 0;
-  virtual PlatformSensorConfiguration GetDefaultConfiguration() = 0;
-
-  // Can be overriden to return the sensor maximum sampling frequency
-  // value obtained from the platform if it is available. If platfrom
-  // does not provide maximum sampling frequency this method must
-  // return default frequency.
-  // The default implementation returns default frequency.
-  virtual double GetMaximumSupportedFrequency();
-
-  // Can be overriden to return the sensor minimum sampling frequency.
-  // The default implementation returns '1.0 / (60 * 60)', i.e. once per hour.
-  virtual double GetMinimumSupportedFrequency();
-
-  mojom::SensorType GetType() const;
-
-  bool StartListening(Client* client,
-                      const PlatformSensorConfiguration& config);
-  bool StopListening(Client* client, const PlatformSensorConfiguration& config);
-
-  void UpdateSensor();
-
-  void AddClient(Client*);
-  void RemoveClient(Client*);
-
- protected:
-  virtual ~PlatformSensor();
-  PlatformSensor(mojom::SensorType type,
-                 mojo::ScopedSharedBufferMapping mapping,
-                 PlatformSensorProvider* provider);
-
-  using ConfigMap = std::map<Client*, std::list<PlatformSensorConfiguration>>;
-  using ReadingBuffer = SensorReadingSharedBuffer;
-
-  virtual bool UpdateSensorInternal(const ConfigMap& configurations);
-  virtual bool StartSensor(
-      const PlatformSensorConfiguration& configuration) = 0;
-  virtual void StopSensor() = 0;
-  virtual bool CheckSensorConfiguration(
-      const PlatformSensorConfiguration& configuration) = 0;
-
-  // Updates shared buffer with new sensor reading data.
-  // Note: this method is thread-safe.
-  void UpdateSensorReading(const SensorReading& reading, bool notify_clients);
-
-  void NotifySensorReadingChanged();
-  void NotifySensorError();
-
-  // For testing purposes.
-  const ConfigMap& config_map() const { return config_map_; }
-
-  // Task runner that is used by mojo objects for the IPC.
-  // If platfrom sensor events are processed on a different
-  // thread, notifications are forwarded to |task_runner_|.
-  scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
-
- private:
-  friend class base::RefCountedThreadSafe<PlatformSensor>;
-  const mojo::ScopedSharedBufferMapping shared_buffer_mapping_;
-  mojom::SensorType type_;
-  base::ObserverList<Client, true> clients_;
-  ConfigMap config_map_;
-  PlatformSensorProvider* provider_;
-  base::WeakPtrFactory<PlatformSensor> weak_factory_;
-  DISALLOW_COPY_AND_ASSIGN(PlatformSensor);
-};
-
-}  // namespace device
-
-#endif  // SERVICES_DEVICE_GENERIC_SENSOR_PLATFORM_SENSOR_H_