Clean up WebVR RequestPresent and make callback asynchronous.

device/vr/android/gvr/gvr_device.cc

 // 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.
 
 #include "device/vr/android/gvr/gvr_device.h"
 
 #include <math.h>
 #include <algorithm>
 
 #include "base/time/time.h"
@@ skipping 199 matching lines @@
 
 void GvrDevice::ResetPose() {
   gvr::GvrApi* gvr_api = GetGvrApi();
 
   // Should never call RecenterTracking when using with Daydream viewers. On
   // those devices recentering should only be done via the controller.
   if (gvr_api && gvr_api->GetViewerType() == GVR_VIEWER_TYPE_CARDBOARD)
     gvr_api->RecenterTracking();
 }
 
-bool GvrDevice::RequestPresent(bool secure_origin) {
+void GvrDevice::RequestPresent(const base::Callback<void(bool)>& callback) {
+  gvr_provider_->RequestPresent(callback);
+}
+
+void GvrDevice::SetSecureOrigin(bool secure_origin) {
   secure_origin_ = secure_origin;
   if (delegate_)
     delegate_->SetWebVRSecureOrigin(secure_origin_);
-
-  return gvr_provider_->RequestPresent();
 }
 
 void GvrDevice::ExitPresent() {
   gvr_provider_->ExitPresent();
   OnExitPresent();
 }
 
 void GvrDevice::SubmitFrame(mojom::VRPosePtr pose) {
   if (delegate_)
     delegate_->SubmitWebVRFrame();
@@ skipping 30 matching lines @@
 }
 
 gvr::GvrApi* GvrDevice::GetGvrApi() {
   if (!delegate_)
     return nullptr;
 
   return delegate_->gvr_api();
 }
 
 }  // namespace device