[ash] Made TriView's re-layout automatically when a child container's visibility changes.

ash/system/audio/volume_view.cc

 // Copyright 2014 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 "ash/system/audio/volume_view.h"
 
 #include <algorithm>
 
 #include "ash/metrics/user_metrics_action.h"
 #include "ash/resources/vector_icons/vector_icons.h"
@@ skipping 156 matching lines @@
 }
 
 void VolumeView::UpdateDeviceTypeAndMore() {
   CrasAudioHandler* audio_handler = CrasAudioHandler::Get();
   // There is no point in letting the user open the audio detailed submenu if
   // there are no alternative output or input devices present, so do not show
   // the 'more' button in the default audio row.
   if (is_default_view_ && !audio_handler->has_alternative_output() &&
       !audio_handler->has_alternative_input()) {
     tri_view_->SetContainerVisible(TriView::Container::END, false);
-    // TODO(tdanderson): TriView itself should trigger a relayout when the
-    // visibility of one of its containers is changed.
-    tri_view_->InvalidateLayout();
     return;
   }
 
   const gfx::VectorIcon& device_icon = GetActiveOutputDeviceVectorIcon();
   const bool device_icon_visibility = !device_icon.is_empty();
 
   if (is_default_view_) {
     if (!more_button_) {
       more_button_ = new ButtonListenerActionableView(
           owner_, TrayPopupInkDropStyle::INSET_BOUNDS, this);
@@ skipping 86 matching lines @@
     if (new_volume > current_volume)
       HandleVolumeUp(new_volume);
     else
       HandleVolumeDown(new_volume);
   }
   icon_->Update();
 }
 
 }  // namespace tray
 }  // namespace ash