VR: Render the current URL and security level on the URL bar.

chrome/browser/android/vr_shell/ui_elements/url_bar.h

Index: chrome/browser/android/vr_shell/ui_elements/url_bar.h
diff --git a/chrome/browser/android/vr_shell/ui_elements/url_bar.h b/chrome/browser/android/vr_shell/ui_elements/url_bar.h
index 526c085dcc495548681eb8388e77847c50bc49e5..8c596f70e8892c4cba5018b763c16b52d006b829 100644
--- a/chrome/browser/android/vr_shell/ui_elements/url_bar.h
+++ b/chrome/browser/android/vr_shell/ui_elements/url_bar.h
@@ -7,6 +7,7 @@
 
 #include <memory>
 
+#include "base/callback.h"
 #include "base/macros.h"
 #include "chrome/browser/android/vr_shell/ui_elements/textured_element.h"
 #include "url/gurl.h"
@@ -22,11 +23,17 @@ class UrlBar : public TexturedElement {
 
   void OnHoverEnter() override;
   void OnHoverLeave() override;
+  void OnButtonUp() override;
+  void SetEnabled(bool enabled);
   void SetURL(const GURL& gurl);
+  void SetSecurityLevel(int level);
+  void SetBackButtonCallback(const base::Callback<void()>& callback);
 
  private:
   UiTexture* GetTexture() const override;
   std::unique_ptr<UrlBarTexture> texture_;
+  base::Callback<void()> back_button_callback_;
+  bool enabled_ = false;
 
   DISALLOW_COPY_AND_ASSIGN(UrlBar);
 };