[Sensors] Decouple sensor readings update from rAF

third_party/WebKit/Source/modules/sensor/SensorReadingUpdater.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 SensorReadingUpdater_h
-#define SensorReadingUpdater_h
-
-#include "device/generic_sensor/public/interfaces/sensor_provider.mojom-blink.h"
-#include "platform/heap/Handle.h"
-
-namespace blink {
-
-class Document;
-class SensorProxy;
-
-// This class encapsulates sensor reading update notification logic.
-class SensorReadingUpdater : public GarbageCollected<SensorReadingUpdater> {
- public:
-  static SensorReadingUpdater* Create(SensorProxy*,
-                                      device::mojom::blink::ReportingMode);
-
-  virtual void Start();
-
-  DECLARE_VIRTUAL_TRACE();
-
- protected:
-  explicit SensorReadingUpdater(SensorProxy*);
-  void EnqueueAnimationFrameTask();
-  virtual void OnAnimationFrameInternal() = 0;
-
-  Member<SensorProxy> sensor_proxy_;
-  WeakMember<Document> document_;
-  bool has_pending_animation_frame_task_;
-
- private:
-  void OnAnimationFrame();
-};
-
-}  // namespace blink
-
-#endif  // SensorReadingUpdater_h