Add missing using statements for JNI types.

device/vr/android/cardboard/cardboard_vr_device.cc

 // Copyright 2015 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.
 
 #include "device/vr/android/cardboard/cardboard_vr_device.h"
 
 #include <math.h>
 #include <algorithm>
 
 #include "base/android/context_utils.h"
 #include "base/android/jni_android.h"
 #include "base/android/jni_array.h"
 #include "base/android/jni_string.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/time/time.h"
 #include "base/trace_event/trace_event.h"
 #include "jni/CardboardVRDevice_jni.h"
 #include "ui/gfx/transform.h"
 #include "ui/gfx/transform_util.h"
 
 using base::android::AttachCurrentThread;
+using base::android::ScopedJavaLocalRef;
 
 namespace device {
 
 CardboardVRDevice::CardboardVRDevice(VRDeviceProvider* provider)
     : VRDevice(provider) {
   JNIEnv* env = AttachCurrentThread();
   j_cardboard_device_.Reset(Java_CardboardVRDevice_create(
       env, base::android::GetApplicationContext()));
   j_head_matrix_.Reset(env, env->NewFloatArray(16));
 }
@@ skipping 111 matching lines @@
 
   return pose;
 }
 
 void CardboardVRDevice::ResetPose() {
   Java_CardboardVRDevice_resetSensor(AttachCurrentThread(),
                                      j_cardboard_device_.obj());
 }
 
 }  // namespace device