[Sensors] Implement sensor data polling

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"
@@ skipping 26 matching lines @@
     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;
 
+    Member<LocalFrame> m_frame;

[haraken, 2016/09/08 11:07:13]

Instead of adding m_frame, I'd make SensorProviderProxy
LocalFrameLifecycleObserver. Then you can use frame().

+
     device::mojom::blink::SensorProviderPtr m_sensorProvider;
 };
 
 } // namespace blink
 
 #endif // SensorProviderProxy_h