Reland of mojo VR interface simpified.

device/vr/vr_device_manager.cc

Index: device/vr/vr_device_manager.cc
diff --git a/device/vr/vr_device_manager.cc b/device/vr/vr_device_manager.cc
index b8c99ea3566c19e288ae011494bb6a1e7add6f04..530feb82cb083761a9a53921e48409aa2976c5f7 100644
--- a/device/vr/vr_device_manager.cc
+++ b/device/vr/vr_device_manager.cc
@@ -23,8 +23,6 @@ VRDeviceManager* g_vr_device_manager = nullptr;
 
 VRDeviceManager::VRDeviceManager()
     : vr_initialized_(false),
-      presenting_service_(nullptr),
-      presenting_device_(nullptr),
       keep_alive_(false),
       has_scheduled_poll_(false) {
 // Register VRDeviceProviders for the current platform
@@ -35,8 +33,6 @@ VRDeviceManager::VRDeviceManager()
 
 VRDeviceManager::VRDeviceManager(std::unique_ptr<VRDeviceProvider> provider)
     : vr_initialized_(false),
-      presenting_service_(nullptr),
-      presenting_device_(nullptr),
       keep_alive_(true),
       has_scheduled_poll_(false) {
   thread_checker_.DetachFromThread();
@@ -56,26 +52,6 @@ VRDeviceManager* VRDeviceManager::GetInstance() {
   return g_vr_device_manager;
 }
 
-// Returns the requested device with the requested id if the specified service
-// is allowed to access it.
-VRDevice* VRDeviceManager::GetAllowedDevice(VRServiceImpl* service,
-                                            unsigned int index) {
-  VRDeviceManager* device_manager = GetInstance();
-
-  // If another service is presenting to the requested device don't allow other
-  // services to access it. That could potentially allow them to spy on
-  // where the user is looking on another page, spam another application with
-  // pose resets, etc.
-  if (device_manager->presenting_service_ &&
-      device_manager->presenting_service_ != service) {
-    if (device_manager->presenting_device_ &&
-        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
@@ -90,21 +66,20 @@ bool VRDeviceManager::HasInstance() {
 }
 
 void VRDeviceManager::AddService(VRServiceImpl* service) {
-  services_.push_back(service);
+  // Loop through any currently active devices and send Connected messages to
+  // the service. Future devices that come online will send a Connected message
+  // when they are created.
+  GetVRDevices(service);
 
-  // Ensure that the device providers are initialized
-  InitializeProviders();
+  services_.push_back(service);
 }
 
 void VRDeviceManager::RemoveService(VRServiceImpl* service) {
   services_.erase(std::remove(services_.begin(), services_.end(), service),
                   services_.end());
 
-  if (service == presenting_service_) {
-    presenting_device_->ExitPresent();
-
-    presenting_service_ = nullptr;
-    presenting_device_ = nullptr;
+  for (auto device : devices_) {
+    device.second->RemoveService(service);
   }
 
   if (services_.empty() && !keep_alive_) {
@@ -113,7 +88,7 @@ void VRDeviceManager::RemoveService(VRServiceImpl* service) {
   }
 }
 
-mojo::Array<VRDisplayPtr> VRDeviceManager::GetVRDevices() {
+bool VRDeviceManager::GetVRDevices(VRServiceImpl* service) {
   DCHECK(thread_checker_.CalledOnValidThread());
 
   InitializeProviders();
@@ -122,7 +97,9 @@ mojo::Array<VRDisplayPtr> VRDeviceManager::GetVRDevices() {
   for (const auto& provider : providers_)
     provider->GetDevices(&devices);
 
-  mojo::Array<VRDisplayPtr> out_devices;
+  if (devices.empty())
+    return false;
+
   for (auto* device : devices) {
     if (device->id() == VR_DEVICE_LAST_ID)
       continue;
@@ -130,17 +107,16 @@ mojo::Array<VRDisplayPtr> VRDeviceManager::GetVRDevices() {
     if (devices_.find(device->id()) == devices_.end())
       devices_[device->id()] = device;
 
-    VRDisplayPtr vr_device_info = device->GetVRDevice();
-    if (vr_device_info.is_null())
-      continue;
+    device->AddService(service);
+  }
 
-    // GetVRDevice should always set the index of the VRDisplay to its own id.
-    DCHECK(vr_device_info->index == device->id());
+  return true;
+}
 
-    out_devices.push_back(std::move(vr_device_info));
-  }
+unsigned int VRDeviceManager::GetNumberOfConnectedDevices() {
+  DCHECK(thread_checker_.CalledOnValidThread());
 
-  return out_devices;
+  return static_cast<unsigned int>(devices_.size());
 }
 
 VRDevice* VRDeviceManager::GetDevice(unsigned int index) {
@@ -157,143 +133,12 @@ VRDevice* VRDeviceManager::GetDevice(unsigned int index) {
   return iter->second;
 }
 
-// These dispatchers must use Clone() instead of std::move to ensure that
-// if there are multiple registered services they all get a copy of the data.
-void VRDeviceManager::OnDeviceChanged(VRDisplayPtr device) {
-  for (const auto& service : services_)
-    service->client()->OnDisplayChanged(device.Clone());
-}
-
-bool VRDeviceManager::RequestPresent(VRServiceImpl* service,
-                                     unsigned int index,
-                                     bool secure_origin) {
-  // Is anything presenting currently?
-  if (presenting_service_) {
-    // Should never have a presenting service without a presenting device.
-    DCHECK(presenting_device_);
-
-    // Fail if the currently presenting service is not the one making the
-    // request.
-    if (presenting_service_ != service)
-      return false;
-
-    // If we are switching presentation from the currently presenting service to
-    // a new device stop presening to the previous one.
-    if (presenting_device_->id() != index) {
-      // Tell the device to stop presenting.
-      presenting_device_->ExitPresent();
-
-      // Only the presenting service needs to be notified that presentation is
-      // ending on the previous device.
-      presenting_service_->client()->OnExitPresent(presenting_device_->id());
-      presenting_device_ = nullptr;
-    }
-
-    presenting_service_ = nullptr;
-  }
-
-  VRDevice* requested_device = GetDevice(index);
-  // Can't present to a device that doesn't exist.
-  if (!requested_device)
-    return false;
-
-  // Attempt to begin presenting to this device. This could fail for any number
-  // of device-specific reasons.
-  if (!requested_device->RequestPresent(secure_origin))
-    return false;
-
-  // Successfully began presenting!
-  presenting_service_ = service;
-  presenting_device_ = requested_device;
-
-  return true;
-}
-
-void VRDeviceManager::ExitPresent(VRServiceImpl* service, unsigned int index) {
-  // Don't allow services other than the currently presenting one to exit
-  // presentation.
-  if (presenting_service_ != service)
-    return;
-
-  // Should never have a presenting service without a presenting device.
-  DCHECK(presenting_device_);
-
-  // Fail if the specified device is not currently presenting.
-  if (presenting_device_->id() != index)
-    return;
-
-  // Tell the client we're done. This must happen before the device's
-  // ExitPresent to avoid invalid mojo state.
-  if (presenting_service_->client()) {
-    presenting_service_->client()->OnExitPresent(index);
-  }
-
-  // Tell the device to stop presenting.
-  presenting_device_->ExitPresent();
-
-  // Clear the presenting service and device.
-  presenting_service_ = nullptr;
-  presenting_device_ = nullptr;
-}
-
-void VRDeviceManager::SubmitFrame(VRServiceImpl* service,
-                                  unsigned int index,
-                                  VRPosePtr pose) {
-  // Don't allow services other than the currently presenting one to submit any
-  // frames.
-  if (presenting_service_ != service)
-    return;
-
-  // Should never have a presenting service without a presenting device.
-  DCHECK(presenting_device_);
-
-  // Don't submit frames to devices other than the currently presenting one.
-  if (presenting_device_->id() != index)
-    return;
-
-  presenting_device_->SubmitFrame(std::move(pose));
-}
-
-void VRDeviceManager::OnDeviceConnectionStatusChanged(VRDevice* device,
-                                                      bool is_connected) {
-  if (is_connected) {
-    VRDisplayPtr vr_device_info = device->GetVRDevice();
-    if (vr_device_info.is_null())
-      return;
-
-    vr_device_info->index = device->id();
-
-    for (const auto& service : services_)
-      service->client()->OnDisplayConnected(vr_device_info.Clone());
-  } else {
-    for (const auto& service : services_)
-      service->client()->OnDisplayDisconnected(device->id());
-  }
-}
-
-void VRDeviceManager::OnPresentEnded(VRDevice* device) {
-  // Ensure the presenting device is the one that we've been requested to stop.
-  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'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::InitializeProviders() {
   if (vr_initialized_) {
     return;
   }
 
   for (const auto& provider : providers_) {
-    provider->SetClient(this);
     provider->Initialize();
   }