Fixes 2D-to-WebVR site transitions when browsing in VR.

device/vr/vr_device.h

 // 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.
 
 #ifndef DEVICE_VR_VR_DEVICE_H
 #define DEVICE_VR_VR_DEVICE_H
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "device/vr/vr_export.h"
 #include "device/vr/vr_service.mojom.h"
 
 namespace device {
 
 class VRDisplayImpl;
 
 const unsigned int VR_DEVICE_LAST_ID = 0xFFFFFFFF;
 
+// Represents one of the platform's VR devices. Owned by the respective
+// VRDeviceProvider.
 class DEVICE_VR_EXPORT VRDevice {
  public:
   VRDevice();
   virtual ~VRDevice();
 
   unsigned int id() const { return id_; }
 
-  virtual void GetVRDevice(
-      const base::Callback<void(mojom::VRDisplayInfoPtr)>& callback) = 0;
+  // Queries VR device for display info and calls onCreated once the display
+  // info object is created. If the query fails onCreated will be called with a
+  // nullptr as argument. onCreated can be called before this function returns.
+  virtual void CreateVRDisplayInfo(
+      const base::Callback<void(mojom::VRDisplayInfoPtr)>& on_created) = 0;
   virtual void ResetPose() = 0;
 
   virtual void RequestPresent(mojom::VRSubmitFrameClientPtr submit_client,
                               const base::Callback<void(bool)>& callback) = 0;
   virtual void SetSecureOrigin(bool secure_origin) = 0;
   virtual void ExitPresent() = 0;
   virtual void SubmitFrame(int16_t frame_index,
                            const gpu::MailboxHolder& mailbox) = 0;
   virtual void UpdateLayerBounds(int16_t frame_index,
                                  mojom::VRLayerBoundsPtr left_bounds,
@@ skipping 33 matching lines @@
   static unsigned int next_id_;
 
   base::WeakPtrFactory<VRDevice> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(VRDevice);
 };
 
 }  // namespace device
 
 #endif  // DEVICE_VR_VR_DEVICE_H