Revert of [Sensors] Reland: Align sensor reading updates and 'onchange' notification with rAF.

third_party/WebKit/Source/modules/sensor/SensorReadingUpdater.cpp

Index: third_party/WebKit/Source/modules/sensor/SensorReadingUpdater.cpp
diff --git a/third_party/WebKit/Source/modules/sensor/SensorReadingUpdater.cpp b/third_party/WebKit/Source/modules/sensor/SensorReadingUpdater.cpp
deleted file mode 100644
index 3d35f7da1f8c0a31755ddbe5f2056c1113818b68..0000000000000000000000000000000000000000
--- a/third_party/WebKit/Source/modules/sensor/SensorReadingUpdater.cpp
+++ /dev/null
@@ -1,112 +0,0 @@
-// 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.
-
-#include "modules/sensor/SensorReadingUpdater.h"
-
-#include "core/dom/Document.h"
-#include "device/generic_sensor/public/interfaces/sensor.mojom-blink.h"
-#include "modules/sensor/SensorProxy.h"
-#include "wtf/CurrentTime.h"
-
-using device::mojom::blink::ReportingMode;
-
-namespace blink {
-
-SensorReadingUpdater::SensorReadingUpdater(SensorProxy* sensorProxy)
-    : m_sensorProxy(sensorProxy), m_hasPendingAnimationFrameTask(false) {}
-
-void SensorReadingUpdater::enqueueAnimationFrameTask() {
-  if (m_hasPendingAnimationFrameTask)
-    return;
-
-  auto callback = WTF::bind(&SensorReadingUpdater::onAnimationFrame,
-                            wrapWeakPersistent(this));
-  m_sensorProxy->document()->enqueueAnimationFrameTask(std::move(callback));
-  m_hasPendingAnimationFrameTask = true;
-}
-
-void SensorReadingUpdater::start() {
-  enqueueAnimationFrameTask();
-}
-
-void SensorReadingUpdater::onAnimationFrame() {
-  m_hasPendingAnimationFrameTask = false;
-  onAnimationFrameInternal();
-}
-
-DEFINE_TRACE(SensorReadingUpdater) {
-  visitor->trace(m_sensorProxy);
-}
-
-class SensorReadingUpdaterContinuous : public SensorReadingUpdater {
- public:
-  explicit SensorReadingUpdaterContinuous(SensorProxy* sensorProxy)
-      : SensorReadingUpdater(sensorProxy) {}
-
-  DEFINE_INLINE_VIRTUAL_TRACE() { SensorReadingUpdater::trace(visitor); }
-
- protected:
-  void onAnimationFrameInternal() override {
-    if (!m_sensorProxy->isActive())
-      return;
-
-    m_sensorProxy->updateSensorReading();
-    m_sensorProxy->notifySensorChanged(WTF::monotonicallyIncreasingTime());
-    enqueueAnimationFrameTask();
-  }
-};
-
-// New data is fetched from shared buffer only once after 'start()'
-// call. Further, notification is send until every client is updated
-// (i.e. until longest notification period elapses) rAF stops after that.
-class SensorReadingUpdaterOnChange : public SensorReadingUpdater {
- public:
-  explicit SensorReadingUpdaterOnChange(SensorProxy* sensorProxy)
-      : SensorReadingUpdater(sensorProxy),
-        m_newDataArrivedTime(0.0),
-        m_newDataArrived(false) {}
-
-  DEFINE_INLINE_VIRTUAL_TRACE() { SensorReadingUpdater::trace(visitor); }
-
-  void start() override {
-    m_newDataArrived = true;
-    SensorReadingUpdater::start();
-  }
-
- protected:
-  void onAnimationFrameInternal() override {
-    if (!m_sensorProxy->isActive())
-      return;
-
-    double timestamp = WTF::monotonicallyIncreasingTime();
-
-    if (m_newDataArrived) {
-      m_newDataArrived = false;
-      m_sensorProxy->updateSensorReading();
-      m_newDataArrivedTime = timestamp;
-    }
-    m_sensorProxy->notifySensorChanged(timestamp);
-
-    DCHECK_GT(m_sensorProxy->frequenciesUsed().front(), 0.0);
-    double longestNotificationPeriod =
-        1 / m_sensorProxy->frequenciesUsed().front();
-
-    if (timestamp - m_newDataArrivedTime <= longestNotificationPeriod)
-      enqueueAnimationFrameTask();
-  }
-
- private:
-  double m_newDataArrivedTime;
-  bool m_newDataArrived;
-};
-
-// static
-SensorReadingUpdater* SensorReadingUpdater::create(SensorProxy* proxy,
-                                                   ReportingMode mode) {
-  if (mode == ReportingMode::CONTINUOUS)
-    return new SensorReadingUpdaterContinuous(proxy);
-  return new SensorReadingUpdaterOnChange(proxy);
-}
-
-}  // namespace blink