Add way to get native VR UI information from Java

chrome/browser/android/vr_shell/vr_shell.h

Index: chrome/browser/android/vr_shell/vr_shell.h
diff --git a/chrome/browser/android/vr_shell/vr_shell.h b/chrome/browser/android/vr_shell/vr_shell.h
index ee85024d41b5e947f7d7c22bdf6c20f41c937d39..60d63d8a8684f7e09dc3fae58c0fb269f7a88b2b 100644
--- a/chrome/browser/android/vr_shell/vr_shell.h
+++ b/chrome/browser/android/vr_shell/vr_shell.h
@@ -129,6 +129,10 @@ class VrShell : public device::PresentingGvrDelegate,
                                 const base::android::JavaParamRef<jobject>& obj,
                                 jboolean can_go_back,
                                 jboolean can_go_forward);
+  void RequestUiElementInfoForTesting(
+      JNIEnv* env,
+      const base::android::JavaParamRef<jobject>& obj,
+      jobjectArray element_names);
 
   void ContentWebContentsDestroyed();
   // Called when our WebContents have been hidden. Usually a sign that something
@@ -168,6 +172,7 @@ class VrShell : public device::PresentingGvrDelegate,
   // Perform a UI action triggered by the javascript API.
   void DoUiAction(const UiAction action,
                   const base::DictionaryValue* arguments);
+  void OnUiElementInfoCreated(std::unique_ptr<base::DictionaryValue> info);
 
   void SetContentCssSize(float width, float height, float dpr);
   void SetUiCssSize(float width, float height, float dpr);