Implement WebVR presentation pausing for VR Shell Menu Mode

device/vr/vr_device_manager.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/vr_device_manager.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/memory/ptr_util.h"
@@ skipping 61 matching lines @@
         device_manager->presenting_device_->id() == index)
       return nullptr;
   }
 
   return device_manager->GetDevice(index);
 }
 
 void VRDeviceManager::SetInstance(VRDeviceManager* instance) {
   // Unit tests can create multiple instances but only one should exist at any
   // given time so g_vr_device_manager should only go from nullptr to
-  // non-nullptr and vica versa.
+  // non-nullptr and vice versa.
   CHECK_NE(!!instance, !!g_vr_device_manager);
   g_vr_device_manager = instance;
 }
 
 bool VRDeviceManager::HasInstance() {
   // For testing. Checks to see if a VRDeviceManager instance is active.
   return !!g_vr_device_manager;
 }
 
 void VRDeviceManager::AddService(VRServiceImpl* service) {
@@ skipping 187 matching lines @@
   DCHECK(presenting_service_);
 
   // Notify the presenting service that it's been forced to end presentation.
   presenting_service_->client()->OnExitPresent(device->id());
 
   // Clear the presenting service and device.
   presenting_service_ = nullptr;
   presenting_device_ = nullptr;
 }
 
+void VRDeviceManager::PausePresent(VRDevice* device) {
+  // Ensure the presenting device is the one that we've been requested to pause.
+  if (!presenting_device_ || presenting_device_ != device)
+    return;
+
+  // Should never have a presenting device without a presenting service.
+  DCHECK(presenting_service_);
+
+  // Notify the presenting service that it should pause.
+  presenting_service_->client()->OnPausePresent(device->id());
+}
+
+void VRDeviceManager::ResumePresent(VRDevice* device) {
+  // Ensure the presenting device is the one that we've been requested to
+  // resume.
+  if (!presenting_device_ || presenting_device_ != device)
+    return;
+
+  // Should never have a presenting device without a presenting service.
+  DCHECK(presenting_service_);
+
+  // Notify the presenting service that it should pause.
+  presenting_service_->client()->OnResumePresent(device->id());
+}
+
 void VRDeviceManager::InitializeProviders() {
   if (vr_initialized_) {
     return;
   }
 
   for (const auto& provider : providers_) {
     provider->SetClient(this);
     provider->Initialize();
   }
 
@@ skipping 19 matching lines @@
   for (const auto& provider : providers_)
     provider->PollEvents();
 }
 
 void VRDeviceManager::StopSchedulingPollEvents() {
   if (has_scheduled_poll_)
     timer_.Stop();
 }
 
 }  // namespace device