[Sensors] Align sensor reading attribute implementation with the specification

third_party/WebKit/Source/modules/sensor/SensorProviderProxy.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 SensorProviderProxy_h
 #define SensorProviderProxy_h
 
 #include "core/frame/LocalFrame.h"
 #include "device/generic_sensor/public/interfaces/sensor.mojom-blink.h"
 #include "device/generic_sensor/public/interfaces/sensor_provider.mojom-blink.h"
 #include "platform/Supplementable.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
 class SensorProxy;
+class SensorReadingFactory;
 
 // This class wraps 'SensorProvider' mojo interface and it manages
 // 'SensorProxy' instances.
 class SensorProviderProxy final
     : public GarbageCollectedFinalized<SensorProviderProxy>,
       public Supplement<LocalFrame> {
   USING_GARBAGE_COLLECTED_MIXIN(SensorProviderProxy);
   WTF_MAKE_NONCOPYABLE(SensorProviderProxy);
 
  public:
   static SensorProviderProxy* from(LocalFrame*);
 
   ~SensorProviderProxy();
 
-  SensorProxy* getOrCreateSensor(device::mojom::blink::SensorType);
+  SensorProxy* createSensor(device::mojom::blink::SensorType,
+                            std::unique_ptr<SensorReadingFactory>);
+
+  SensorProxy* getSensor(device::mojom::blink::SensorType);
 
   DECLARE_VIRTUAL_TRACE();
 
  private:
   friend class SensorProxy;  // To call sensorProvider().
 
   explicit SensorProviderProxy(LocalFrame*);
   static const char* supplementName();
 
   device::mojom::blink::SensorProvider* sensorProvider() const {
     return m_sensorProvider.get();
   }
 
   void onSensorProviderConnectionError();
 
   using SensorsSet = HeapHashSet<WeakMember<SensorProxy>>;
   SensorsSet m_sensors;
 
   device::mojom::blink::SensorProviderPtr m_sensorProvider;
 };
 
 }  // namespace blink
 
 #endif  // SensorProviderProxy_h