mojo VR interface simplified

device/vr/vr_device.cc

Index: device/vr/vr_device.cc
diff --git a/device/vr/vr_device.cc b/device/vr/vr_device.cc
index 5e3d7fc253d6fa29c2755622baf9241df7ca49b5..d4403e6d2c9d6a75153456b1ea9c0d361ec4ba83 100644
--- a/device/vr/vr_device.cc
+++ b/device/vr/vr_device.cc
@@ -4,13 +4,14 @@
 
 #include "device/vr/vr_device.h"
 #include "device/vr/vr_device_provider.h"
+#include "device/vr/vr_service_impl.h"
 
 namespace device {
 
 unsigned int VRDevice::next_id_ = 1;
 
 VRDevice::VRDevice(VRDeviceProvider* provider)
-    : provider_(provider), id_(next_id_) {
+    : presenting_service_(nullptr), provider_(provider), id_(next_id_) {
   // Prevent wraparound. Devices with this ID will be treated as invalid.
   if (next_id_ != VR_DEVICE_LAST_ID)
     next_id_++;
@@ -18,8 +19,27 @@ VRDevice::VRDevice(VRDeviceProvider* provider)
 
 VRDevice::~VRDevice() {}
 
-bool VRDevice::RequestPresent(bool secure_origin) {
+bool VRDevice::RequestPresent(VRServiceImpl* service, bool secure_origin) {
   return true;
 };
 
+void VRDevice::RegisterDisplayService(VRServiceImpl* service,
+                                      VRDisplayServicePtr display_service) {
+  display_services_.insert(std::pair<VRServiceImpl*, VRDisplayServicePtr>(
+      service, std::move(display_service)));
+}
+
+void VRDevice::RemoveService(VRServiceImpl* service) {
+  ExitPresent(service);
+  display_services_.erase(service);
+}
+
+bool VRDevice::CheckAccessAllowed(VRServiceImpl* service) {
+  return (!presenting_service_ || presenting_service_ == service);
+}
+
+bool VRDevice::IsPresentingService(VRServiceImpl* service) {
+  return (presenting_service_ && presenting_service_ == service);
+}
+
 }  // namespace device