Implement our own GLThread for VR Shell.

chrome/browser/android/vr_shell/vr_shell_delegate.h

Index: chrome/browser/android/vr_shell/vr_shell_delegate.h
diff --git a/chrome/browser/android/vr_shell/vr_shell_delegate.h b/chrome/browser/android/vr_shell/vr_shell_delegate.h
index 0d3cbf47ade3cb6ac31852690f2d3c22c21c7acd..97bf2bb8ea5456ffc91961836b825330d798458b 100644
--- a/chrome/browser/android/vr_shell/vr_shell_delegate.h
+++ b/chrome/browser/android/vr_shell/vr_shell_delegate.h
@@ -24,7 +24,8 @@ class VrShellDelegate : public device::GvrDelegateProvider {
 
   static VrShellDelegate* GetNativeDelegate(JNIEnv* env, jobject jdelegate);
 
-  base::WeakPtr<device::GvrDeviceProvider> GetDeviceProvider();
+  void SetDelegate(const base::WeakPtr<device::GvrDelegate>& delegate);
+  void RemoveDelegate();
 
   void SetPresentResult(JNIEnv* env, jobject obj, jboolean result);
   void DisplayActivate(JNIEnv* env, jobject obj);
@@ -44,6 +45,7 @@ class VrShellDelegate : public device::GvrDelegateProvider {
   std::unique_ptr<device::GvrDelegate> non_presenting_delegate_;
   base::android::ScopedJavaGlobalRef<jobject> j_vr_shell_delegate_;
   base::WeakPtr<device::GvrDeviceProvider> device_provider_;
+  base::WeakPtr<device::GvrDelegate> delegate_;
   base::Callback<void(bool)> present_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(VrShellDelegate);