[Sensors] Improvements in fetching reading for sensors with continuous reporting mode

third_party/WebKit/Source/modules/sensor/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 Sensor_h
 #define Sensor_h
 
 #include "bindings/core/v8/ActiveScriptWrappable.h"
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "core/dom/ActiveDOMObject.h"
 #include "core/dom/ContextLifecycleObserver.h"
 #include "core/frame/PlatformEventController.h"
-#include "core/page/PageVisibilityObserver.h"
 #include "modules/EventTargetModules.h"
 #include "modules/sensor/SensorOptions.h"
 #include "modules/sensor/SensorProxy.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
 class ExceptionState;
 class ScriptState;
 class SensorReading;
-class SensorPollingStrategy;
+class SensorUpdateNotificationStrategy;
 
 class Sensor : public EventTargetWithInlineData,
                public ActiveScriptWrappable,
                public ContextLifecycleObserver,
-               public PageVisibilityObserver,
                public SensorProxy::Observer {
   USING_GARBAGE_COLLECTED_MIXIN(Sensor);
   DEFINE_WRAPPERTYPEINFO();
 
  public:
   enum class SensorState { Idle, Activating, Active, Errored };
 
   ~Sensor() override;
 
   void start(ScriptState*, ExceptionState&);
@@ skipping 42 matching lines @@
 
   // ContextLifecycleObserver overrides.
   void contextDestroyed() override;
 
   // SensorController::Observer overrides.
   void onSensorInitialized() override;
   void onSensorReadingChanged() override;
   void onSensorError(ExceptionCode,
                      const String& sanitizedMessage,
                      const String& unsanitizedMessage) override;
+  void onSuspended() override;
 
   void onStartRequestCompleted(bool);
   void onStopRequestCompleted(bool);
 
-  // PageVisibilityObserver overrides.
-  void pageVisibilityChanged() override;
-
   void startListening();
   void stopListening();
 
-  // Makes sensor reading refresh its values from the shared buffer.
-  void pollForData();
+  void onSensorUpdateNotification();
 
   void updateState(SensorState newState);
   void reportError(ExceptionCode = UnknownError,
                    const String& sanitizedMessage = String(),
                    const String& unsanitizedMessage = String());
 
-  void updatePollingStatus();
-
   void notifySensorReadingChanged();
   void notifyOnActivate();
   void notifyError(DOMException* error);
 
  private:
   SensorOptions m_sensorOptions;
   device::mojom::blink::SensorType m_type;
   SensorState m_state;
   Member<SensorProxy> m_sensorProxy;
-  std::unique_ptr<SensorPollingStrategy> m_polling;
+  std::unique_ptr<SensorUpdateNotificationStrategy> m_sensorUpdateNotifier;
   device::SensorReading m_storedData;
   SensorConfigurationPtr m_configuration;
 };
 
 }  // namespace blink
 
 #endif  // Sensor_h