[Android] Move the android Device Sensors API to the UI thread.

content/browser/device_sensors/sensor_manager_android.h

Index: content/browser/device_sensors/sensor_manager_android.h
diff --git a/content/browser/device_sensors/sensor_manager_android.h b/content/browser/device_sensors/sensor_manager_android.h
index 714b8ec04165bdad26d3301a5d1137458229c788..535efa1c1c92a6970cebbb26f7877347933bbb17 100644
--- a/content/browser/device_sensors/sensor_manager_android.h
+++ b/content/browser/device_sensors/sensor_manager_android.h
@@ -52,6 +52,8 @@ class CONTENT_EXPORT SensorManagerAndroid {
       DeviceOrientationHardwareBuffer* buffer);
   void StopFetchingDeviceOrientationData();
 
+  void Shutdown();
+
  protected:
   enum EventType {
     // These constants should match DEVICE_ORIENTATION, DEVICE_MOTION and
@@ -69,6 +71,16 @@ class CONTENT_EXPORT SensorManagerAndroid {
   virtual void Stop(EventType event_type);
   virtual int GetNumberActiveDeviceMotionSensors();
 
+  void StartFetchingLightDataOnUI(DeviceLightHardwareBuffer* buffer);
+  void StopFetchingLightDataOnUI();
+
+  void StartFetchingMotionDataOnUI(DeviceMotionHardwareBuffer* buffer);
+  void StopFetchingMotionDataOnUI();
+
+  void StartFetchingOrientationDataOnUI(
+      DeviceOrientationHardwareBuffer* buffer);
+  void StopFetchingOrientationDataOnUI();
+
  private:
   friend struct DefaultSingletonTraits<SensorManagerAndroid>;
 
@@ -104,6 +116,7 @@ class CONTENT_EXPORT SensorManagerAndroid {
   base::Lock orientation_buffer_lock_;
 
   bool is_using_backup_sensors_for_orientation_;
+  bool is_shutdown_;
 
   DISALLOW_COPY_AND_ASSIGN(SensorManagerAndroid);
 };