Clean up WebVR RequestPresent and make callback asynchronous.

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/macros.h"
 #include "device/vr/vr_export.h"
 #include "device/vr/vr_service.mojom.h"
@@ skipping 17 matching lines @@
  public:
   VRDevice();
   virtual ~VRDevice();
 
   unsigned int id() const { return id_; }
 
   virtual mojom::VRDisplayInfoPtr GetVRDevice() = 0;
   virtual mojom::VRPosePtr GetPose() = 0;
   virtual void ResetPose() = 0;
 
-  virtual bool RequestPresent(bool secure_origin) = 0;
+  virtual void RequestPresent(const base::Callback<void(bool)>& callback) = 0;
+  virtual void SetSecureOrigin(bool secure_origin) = 0;
   virtual void ExitPresent() = 0;
   virtual void SubmitFrame(mojom::VRPosePtr pose) = 0;
   virtual void UpdateLayerBounds(mojom::VRLayerBoundsPtr left_bounds,
                                  mojom::VRLayerBoundsPtr right_bounds) = 0;
 
   virtual void AddService(VRServiceImpl* service);
   virtual void RemoveService(VRServiceImpl* service);
 
   // TODO(shaobo.yan@intel.com): Checks should be done against VRDisplayImpl and
   // the name should be considered.
@@ skipping 26 matching lines @@
   unsigned int id_;
 
   static unsigned int next_id_;
 
   DISALLOW_COPY_AND_ASSIGN(VRDevice);
 };
 
 }  // namespace device
 
 #endif  // DEVICE_VR_VR_DEVICE_H