VR: Factor transient timing out of UiSceneManager.

chrome/browser/android/vr_shell/ui_elements/presentation_toast.cc

 // 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.
 
 #include "chrome/browser/android/vr_shell/ui_elements/presentation_toast.h"
 
 #include "base/memory/ptr_util.h"
 #include "chrome/browser/android/vr_shell/textures/presentation_toast_texture.h"
 
 namespace vr_shell {
 
-PresentationToast::PresentationToast(int preferred_width)
+PresentationToast::PresentationToast(int preferred_width,
+                                     const base::TimeDelta& timeout)
     : TexturedElement(preferred_width),
-      texture_(base::MakeUnique<PresentationToastTexture>()) {}
+      texture_(base::MakeUnique<PresentationToastTexture>()),
+      transience_(this, base::TimeDelta::FromSeconds(10)) {}

[bshe, 2017/06/27 14:57:09]

Use |timeout| instead?

[cjgrant, 2017/06/28 19:00:54]

Done.  Oops!

 
 PresentationToast::~PresentationToast() = default;
 
 UiTexture* PresentationToast::GetTexture() const {
   return texture_.get();
 }
 
+void PresentationToast::SetEnabled(bool enabled) {
+  transience_.SetEnabled(enabled);
+}
+
 }  // namespace vr_shell