Add way to get native VR UI information from Java

chrome/browser/android/vr_shell/vr_shell.h

 // 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.
 
 #ifndef CHROME_BROWSER_ANDROID_VR_SHELL_VR_SHELL_H_
 #define CHROME_BROWSER_ANDROID_VR_SHELL_VR_SHELL_H_
 
 #include <jni.h>
 
 #include <memory>
@@ skipping 110 matching lines @@
                     jint id);
   base::android::ScopedJavaGlobalRef<jobject> TakeContentSurface(
       JNIEnv* env,
       const base::android::JavaParamRef<jobject>& obj);
   void RestoreContentSurface(JNIEnv* env,
                              const base::android::JavaParamRef<jobject>& obj);
   void SetHistoryButtonsEnabled(JNIEnv* env,
                                 const base::android::JavaParamRef<jobject>& obj,
                                 jboolean can_go_back,
                                 jboolean can_go_forward);
+  void RequestUiElementInfo(JNIEnv* env,
+                            const base::android::JavaParamRef<jobject>& obj,
+                            jintArray element_ids,
+                            jint callback_id);
 
   void ContentWebContentsDestroyed();
   // Called when our WebContents have been hidden. Usually a sign that something
   // like another tab placed in front of it.
   void ContentWasHidden();
   void ContentWasShown();
 
   // html/js UI hooks.
   static base::WeakPtr<VrShell> GetWeakPtr(
       const content::WebContents* web_contents);
@@ skipping 19 matching lines @@
       const base::android::JavaParamRef<jobject>& object,
       jint width,
       jint height,
       jfloat dpr);
 
   void UpdateScene(const base::ListValue* args);
 
   // Perform a UI action triggered by the javascript API.
   void DoUiAction(const UiAction action,
                   const base::DictionaryValue* arguments);
+  void OnUiElementInfoCreated(int callback_id,
+                              std::unique_ptr<base::DictionaryValue> info);
 
   void SetContentCssSize(float width, float height, float dpr);
   void SetUiCssSize(float width, float height, float dpr);
 
   void ContentFrameWasResized(bool width_changed);
 
   void ForceExitVr();
 
   void ProcessUIGesture(std::unique_ptr<blink::WebInputEvent> event);
   void ProcessContentGesture(std::unique_ptr<blink::WebInputEvent> event);
@@ skipping 84 matching lines @@
   base::WeakPtrFactory<VrShell> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(VrShell);
 };
 
 bool RegisterVrShell(JNIEnv* env);
 
 }  // namespace vr_shell
 
 #endif  // CHROME_BROWSER_ANDROID_VR_SHELL_VR_SHELL_H_