[sensors] [win] Fix ambient light not working properly Windows 10.

device/generic_sensor/platform_sensor_reader_win.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 DEVICE_GENERIC_SENSOR_PLATFORM_SENSOR_READER_WIN_H_
 #define DEVICE_GENERIC_SENSOR_PLATFORM_SENSOR_READER_WIN_H_
 
 #include <SensorsApi.h>
 
 #include "base/win/scoped_comptr.h"
@@ skipping 36 matching lines @@
 
  private:
   PlatformSensorReaderWin(base::win::ScopedComPtr<ISensor> sensor,
                           std::unique_ptr<ReaderInitParams> params);
 
   static base::win::ScopedComPtr<ISensor> GetSensorForType(
       REFSENSOR_TYPE_ID sensor_type,
       base::win::ScopedComPtr<ISensorManager> sensor_manager);
 
   bool SetReportingInterval(const PlatformSensorConfiguration& configuration);
+  void ListenSensorEvent();
   HRESULT SensorReadingChanged(ISensorDataReport& report,
                                SensorReading& reading) const;
   void SensorError();
 
  private:
   friend class EventListener;
 
   const std::unique_ptr<ReaderInitParams> init_params_;
   scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
   // Following class members are protected by lock, because SetClient,
   // StartSensor and StopSensor are called from another thread by
   // PlatformSensorWin that can modify internal state of the object.
   base::Lock lock_;
   bool sensor_active_;
   Client* client_;
   base::win::ScopedComPtr<ISensor> sensor_;
   scoped_refptr<EventListener> event_listener_;
+  base::WeakPtrFactory<PlatformSensorReaderWin> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PlatformSensorReaderWin);
 };
 
 }  // namespace device
 
 #endif  // DEVICE_GENERIC_SENSOR_PLATFORM_SENSOR_READER_WIN_H_