Implement our own GLThread for VR Shell.

chrome/browser/android/vr_shell/vr_shell_delegate.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 "chrome/browser/android/vr_shell/vr_shell_delegate.h"
 
 #include "base/android/jni_android.h"
 #include "chrome/browser/android/vr_shell/vr_shell.h"
 #include "device/vr/android/gvr/gvr_device_provider.h"
 #include "jni/VrShellDelegate_jni.h"
@@ skipping 41 matching lines @@
 VrShellDelegate::~VrShellDelegate() {
   GvrDelegateProvider::SetInstance(nullptr);
 }
 
 VrShellDelegate* VrShellDelegate::GetNativeDelegate(
     JNIEnv* env, jobject jdelegate) {
   long native_delegate = Java_VrShellDelegate_getNativePointer(env, jdelegate);
   return reinterpret_cast<VrShellDelegate*>(native_delegate);
 }
 
-base::WeakPtr<device::GvrDeviceProvider> VrShellDelegate::GetDeviceProvider() {
-  return device_provider_;
+void VrShellDelegate::SetDelegate(
+    const base::WeakPtr<device::GvrDelegate>& delegate) {
+  // TODO(mthiesse): There's no reason for this delegate to be a WeakPtr
+  // anymore.
+  delegate_ = delegate;
+  if (device_provider_.get()) {
+    device_provider_->OnGvrDelegateReady(delegate_);
+  }
+}
+
+void VrShellDelegate::RemoveDelegate() {
+  delegate_.reset();
+  if (device_provider_.get()) {
+    device_provider_->OnGvrDelegateRemoved();
+  }
 }
 
 void VrShellDelegate::SetPresentResult(JNIEnv* env, jobject obj,
                                        jboolean result) {
   CHECK(!present_callback_.is_null());
   present_callback_.Run(result);
   present_callback_.Reset();
 }
 
 void VrShellDelegate::DisplayActivate(JNIEnv* env, jobject obj) {
   if (device_provider_) {
     device_provider_->OnDisplayActivate();
   }
 }
 
 void VrShellDelegate::SetDeviceProvider(
     base::WeakPtr<device::GvrDeviceProvider> device_provider) {
   device_provider_ = device_provider;
+  if (delegate_.get()) {
+    device_provider_->OnGvrDelegateReady(delegate_);
+  }
 }
 
 void VrShellDelegate::RequestWebVRPresent(
     const base::Callback<void(bool)>& callback) {
   if (!present_callback_.is_null()) {
     // Can only handle one request at a time. This is also extremely unlikely to
     // happen in practice.
     callback.Run(false);
     return;
   }
@@ skipping 52 matching lines @@
 
 bool RegisterVrShellDelegate(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 jlong Init(JNIEnv* env, const JavaParamRef<jobject>& obj) {
   return reinterpret_cast<intptr_t>(new VrShellDelegate(env, obj));
 }
 
 }  // namespace vr_shell