[Device Sensors] Move Mojo communication to UI thread on Android

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"
@@ skipping 15 matching lines @@
 // Android implementation of Device {Motion|Orientation|Light} API.
 //
 // Android's SensorManager has a push API, so when Got*() methods are called
 // by the system the browser process puts the received data into a shared
 // memory buffer, which is read by the renderer processes.
 class CONTENT_EXPORT SensorManagerAndroid {
  public:
   // Must be called at startup, before GetInstance().
   static bool Register(JNIEnv* env);
 
-  // Needs to be thread-safe, because accessed from different threads.
+  // Should be called only on the UI thread.
   static SensorManagerAndroid* GetInstance();
 
   // Called from Java via JNI.
   void GotLight(JNIEnv*,
                 const base::android::JavaParamRef<jobject>&,
                 double value);
   void GotOrientation(JNIEnv*,
                       const base::android::JavaParamRef<jobject>&,
                       double alpha,
                       double beta,
@@ skipping 56 matching lines @@
   // Returns true if the registration with sensors was successful.
   virtual bool Start(ConsumerType consumer_type);
   // Stops listening to the sensors corresponding to the consumer_type.
   virtual void Stop(ConsumerType consumer_type);
   // Returns currently used sensor type for device orientation.
   virtual OrientationSensorType GetOrientationSensorTypeUsed();
   // Returns the number of active sensors corresponding to
   // ConsumerType.DEVICE_MOTION.
   virtual int GetNumberActiveDeviceMotionSensors();
 
-  void StartFetchingLightDataOnUI(DeviceLightHardwareBuffer* buffer);
-  void StopFetchingLightDataOnUI();
-
-  void StartFetchingMotionDataOnUI(DeviceMotionHardwareBuffer* buffer);
-  void StopFetchingMotionDataOnUI();
-
-  void StartFetchingOrientationDataOnUI(
-      DeviceOrientationHardwareBuffer* buffer);
-  void StopFetchingOrientationDataOnUI();
-
-  void StartFetchingOrientationAbsoluteDataOnUI(
-      DeviceOrientationHardwareBuffer* buffer);
-  void StopFetchingOrientationAbsoluteDataOnUI();
-
  private:
   friend struct base::DefaultSingletonTraits<SensorManagerAndroid>;
 
   enum {
     RECEIVED_MOTION_DATA_ACCELERATION = 0,
     RECEIVED_MOTION_DATA_ACCELERATION_INCL_GRAVITY = 1,
     RECEIVED_MOTION_DATA_ROTATION_RATE = 2,
     RECEIVED_MOTION_DATA_MAX = 3,
   };
 
@@ skipping 24 matching lines @@
   base::Lock orientation_absolute_buffer_lock_;
 
   bool is_shutdown_;
 
   DISALLOW_COPY_AND_ASSIGN(SensorManagerAndroid);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DEVICE_SENSORS_SENSOR_MANAGER_ANDROID_H_