Implement WebVR presentation pausing for VR Shell Menu Mode

device/vr/android/gvr/gvr_device_provider.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_provider.h"
 
 #include <jni.h>
 
 #include "base/android/context_utils.h"
 #include "base/android/jni_android.h"
 #include "base/android/jni_utils.h"
 #include "base/android/scoped_java_ref.h"
 #include "device/vr/android/gvr/gvr_delegate.h"
 #include "device/vr/android/gvr/gvr_device.h"
 #include "device/vr/android/gvr/gvr_gamepad_data_fetcher.h"
 #include "device/vr/vr_device_manager.h"
 #include "third_party/gvr-android-sdk/src/ndk/include/vr/gvr/capi/include/gvr.h"
 #include "third_party/gvr-android-sdk/src/ndk/include/vr/gvr/capi/include/gvr_controller.h"
 #include "third_party/gvr-android-sdk/src/ndk/include/vr/gvr/capi/include/gvr_types.h"
 
 using base::android::AttachCurrentThread;
 using base::android::GetApplicationContext;
 
 namespace device {
 
-GvrDeviceProvider::GvrDeviceProvider()
-    : VRDeviceProvider(),
-      main_thread_task_runner_(base::ThreadTaskRunnerHandle::Get()) {}
+GvrDeviceProvider::GvrDeviceProvider() : weak_ptr_factory_(this) {}
 
 GvrDeviceProvider::~GvrDeviceProvider() {
   device::GvrDelegateProvider* delegate_provider =
       device::GvrDelegateProvider::GetInstance();
   if (delegate_provider)
     delegate_provider->DestroyNonPresentingDelegate();
 
   ExitPresent();
 }
 
@@ skipping 16 matching lines @@
   }
 }
 
 bool GvrDeviceProvider::RequestPresent() {
   device::GvrDelegateProvider* delegate_provider =
       device::GvrDelegateProvider::GetInstance();
   if (!delegate_provider)
     return false;
 
   // RequestWebVRPresent is async as a render thread may be created.
-  return delegate_provider->RequestWebVRPresent(this);
+  return delegate_provider->RequestWebVRPresent(weak_ptr_factory_.GetWeakPtr());
 }
 
 void GvrDeviceProvider::ExitPresent() {
-  DCHECK(main_thread_task_runner_->BelongsToCurrentThread());
-
   if (!vr_device_)
     return;
 
   device::GvrDelegateProvider* delegate_provider =
       device::GvrDelegateProvider::GetInstance();
   if (!delegate_provider)
     return;
 
   vr_device_->SetDelegate(delegate_provider->GetNonPresentingDelegate());
 
   GamepadDataFetcherManager::GetInstance()->RemoveSourceFactory(
       GAMEPAD_SOURCE_GVR);
 
   delegate_provider->ExitWebVRPresent();
 }
 
-void GvrDeviceProvider::OnGvrDelegateReady(GvrDelegate* delegate) {
-  main_thread_task_runner_->PostTask(
-      FROM_HERE,
-      base::Bind(&GvrDeviceProvider::GvrDelegateReady, base::Unretained(this),
-                 base::Unretained(delegate)));
-}
-
-void GvrDeviceProvider::OnGvrDelegateRemoved() {
-  DCHECK(main_thread_task_runner_->BelongsToCurrentThread());
+void GvrDeviceProvider::OnGvrDelegateReady(
+    const base::WeakPtr<GvrDelegate>& delegate) {
   if (!vr_device_)
     return;
-  ExitPresent();
-}
-
-void GvrDeviceProvider::GvrDelegateReady(GvrDelegate* delegate) {
-  DCHECK(main_thread_task_runner_->BelongsToCurrentThread());
-
   vr_device_->SetDelegate(delegate);
   GamepadDataFetcherManager::GetInstance()->AddFactory(
       new GvrGamepadDataFetcher::Factory(delegate, vr_device_->id()));
 }
 
+void GvrDeviceProvider::OnGvrDelegateRemoved() {
+  ExitPresent();
+}
+
+void GvrDeviceProvider::OnDisplayBlur() {
+  if (!vr_device_)
+    return;
+  vr_device_->OnDisplayBlur();
+}
+
+void GvrDeviceProvider::OnDisplayFocus() {
+  if (!vr_device_)
+    return;
+  vr_device_->OnDisplayFocus();
+}
+
 }  // namespace device