[sensors] Make generic_sensor a component

device/generic_sensor/android/sensors_jni_registrar.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_ANDROID_SENSORS_JNI_REGISTRAR_H_
 #define DEVICE_GENERIC_SENSOR_ANDROID_SENSORS_JNI_REGISTRAR_H_
 
 #include <jni.h>
 
+#include "device/generic_sensor/generic_sensor_export.h"
+
 namespace device {
 namespace android {
 
 // Registers C++ methods in device/generic_sensor classes with JNI.
 // See https://www.chromium.org/developers/design-documents/android-jni
 //
 // Must be called before classes in the Sensors module are used.
-bool RegisterSensorsJni(JNIEnv* env);
+bool DEVICE_GENERIC_SENSOR_EXPORT RegisterSensorsJni(JNIEnv* env);
 
 }  // namespace android
 }  // namespace device
 
 #endif  // DEVICE_GENERIC_SENSOR_ANDROID_SENSORS_JNI_REGISTRAR_H_