VR: Factor transient timing out of UiSceneManager.

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

 // Copyright 2017 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_UI_ELEMENTS_TRANSIENT_URL_BAR_H_
 #define CHROME_BROWSER_ANDROID_VR_SHELL_UI_ELEMENTS_TRANSIENT_URL_BAR_H_
 
 #include <memory>
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/time/time.h"
 #include "chrome/browser/android/vr_shell/ui_elements/textured_element.h"
+#include "chrome/browser/android/vr_shell/ui_elements/transience_manager.h"
 #include "chrome/browser/android/vr_shell/ui_unsupported_mode.h"
 #include "components/security_state/core/security_state.h"
 #include "url/gurl.h"
 
 namespace vr_shell {
 
 class UrlBarTexture;
 struct ToolbarState;
 
 // The non-interactive URL bar that shows for some time when WebVR content is
 // autopresented.
 class TransientUrlBar : public TexturedElement {
  public:
   TransientUrlBar(
       int preferred_width,
+      const base::TimeDelta& timeout,
       const base::Callback<void(UiUnsupportedMode)>& failure_callback);
   ~TransientUrlBar() override;
 
+  void SetEnabled(bool enabled) override;
+
   void SetToolbarState(const ToolbarState& state);
 
  private:
   UiTexture* GetTexture() const override;
 
   std::unique_ptr<UrlBarTexture> texture_;
+  TransienceManager transience_;
 
   DISALLOW_COPY_AND_ASSIGN(TransientUrlBar);
 };
 
 }  // namespace vr_shell
 
 #endif  // CHROME_BROWSER_ANDROID_VR_SHELL_UI_ELEMENTS_TRANSIENT_URL_BAR_H_