Implement lazy initialization for VrShellDelegate

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 a1e00ae3ee58c2332c1aaa8c225f4f5f5f66b732..72efcd0efb6fd60f52f5db4b153b28d41262856b 100644
--- a/chrome/browser/android/vr_shell/vr_shell_delegate.h
+++ b/chrome/browser/android/vr_shell/vr_shell_delegate.h
@@ -27,6 +27,8 @@ class VrShellDelegate : public device::GvrDelegateProvider {
   VrShellDelegate(JNIEnv* env, jobject obj);
   ~VrShellDelegate() override;
 
+  static device::GvrDelegateProvider* CreateVrShellDelegate();
+
   static VrShellDelegate* GetNativeVrShellDelegate(JNIEnv* env,
                                                    jobject jdelegate);
 
@@ -44,6 +46,7 @@ class VrShellDelegate : public device::GvrDelegateProvider {
                            jdouble interval_seconds);
   void OnPause(JNIEnv* env, const base::android::JavaParamRef<jobject>& obj);
   void OnResume(JNIEnv* env, const base::android::JavaParamRef<jobject>& obj);
+  void Destroy(JNIEnv* env, const base::android::JavaParamRef<jobject>& obj);
   void ShowTab(int id);
 
   device::GvrDeviceProvider* device_provider() { return device_provider_; }