[WebVR] Only count devices that have successfully connected.

device/vr/vr_service_impl.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_VR_VR_SERVICE_IMPL_H
 #define DEVICE_VR_VR_SERVICE_IMPL_H
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 42 matching lines @@
 
   void SetListeningForActivate(bool listening) override;
   void OnVRDisplayInfoCreated(VRDevice* device,
                               mojom::VRDisplayInfoPtr display_info);
 
   std::map<VRDevice*, std::unique_ptr<VRDisplayImpl>> displays_;
 
   mojom::VRServiceClientPtr client_;
 
   bool listening_for_activate_;
+  unsigned connected_devices_;
 
   base::WeakPtrFactory<VRServiceImpl> weak_ptr_factory_;
 
   // Getter for testing.
   DEVICE_VR_EXPORT VRDisplayImpl* GetVRDisplayImplForTesting(VRDevice* device);
 
   DISALLOW_COPY_AND_ASSIGN(VRServiceImpl);
 };
 
 }  // namespace device
 
 #endif  // DEVICE_VR_VR_SERVICE_IMPL_H