Remove content::BrowserThread knowledge from Device Sensors

content/browser/device_sensors/sensor_manager_android.h

 // Copyright 2014 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 CONTENT_BROWSER_DEVICE_SENSORS_SENSOR_MANAGER_ANDROID_H_
 #define CONTENT_BROWSER_DEVICE_SENSORS_SENSOR_MANAGER_ANDROID_H_
 
 #include <memory>
 
 #include "base/android/scoped_java_ref.h"
 #include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "base/sequenced_task_runner.h"
 #include "base/synchronization/lock.h"
 #include "content/browser/device_sensors/device_sensors_consts.h"
 #include "content/common/content_export.h"
 #include "device/sensors/public/cpp/device_light_hardware_buffer.h"
 #include "device/sensors/public/cpp/device_motion_hardware_buffer.h"
 #include "device/sensors/public/cpp/device_orientation_hardware_buffer.h"
 
 namespace base {
 template <typename T>
 struct DefaultSingletonTraits;
@@ skipping 53 matching lines @@
   void StopFetchingDeviceMotionData();
 
   void StartFetchingDeviceOrientationData(
       DeviceOrientationHardwareBuffer* buffer);
   void StopFetchingDeviceOrientationData();
 
   void StartFetchingDeviceOrientationAbsoluteData(
       DeviceOrientationHardwareBuffer* buffer);
   void StopFetchingDeviceOrientationAbsoluteData();
 
-  void Shutdown();
+  void SetUITaskRunner(scoped_refptr<base::SequencedTaskRunner> ui_task_runner);
+  void ShutDownOnUIThread();
 
   // A Java counterpart will be generated for this enum.
   // GENERATED_JAVA_ENUM_PACKAGE: org.chromium.content.browser
   // When adding new constants don't modify the order as they are used for UMA.
   enum OrientationSensorType {
     NOT_AVAILABLE = 0,
     ROTATION_VECTOR = 1,
     ACCELEROMETER_MAGNETIC = 2,
     GAME_ROTATION_VECTOR = 3,
     ORIENTATION_SENSOR_MAX = 4,
@@ skipping 57 matching lines @@
 
   bool motion_buffer_initialized_;
   bool orientation_buffer_initialized_;
   bool orientation_absolute_buffer_initialized_;
 
   base::Lock light_buffer_lock_;
   base::Lock motion_buffer_lock_;
   base::Lock orientation_buffer_lock_;
   base::Lock orientation_absolute_buffer_lock_;
 
+  scoped_refptr<base::SequencedTaskRunner> ui_task_runner_;
+
   bool is_shutdown_;
 
   DISALLOW_COPY_AND_ASSIGN(SensorManagerAndroid);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DEVICE_SENSORS_SENSOR_MANAGER_ANDROID_H_