[ash-md] Cancels app-list (launcher) before entering overview

ash/app_list/app_list_presenter_delegate.cc

 // Copyright (c) 2012 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/app_list/app_list_presenter_delegate.h"
 
 #include "ash/common/ash_switches.h"
 #include "ash/common/shelf/app_list_button.h"
 #include "ash/common/shelf/shelf_types.h"
 #include "ash/common/shell_window_ids.h"
@@ skipping 318 matching lines @@
   UpdateBounds();
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // AppListPresenterDelegate, ShellObserver implementation:
 void AppListPresenterDelegate::OnShelfAlignmentChanged(WmWindow* root_window) {
   if (view_)
     view_->SetBubbleArrow(GetBubbleArrow(view_->GetWidget()->GetNativeView()));
 }
 
+void AppListPresenterDelegate::OnOverviewModeStarting() {
+  if (is_visible_)
+    presenter_->Dismiss();
+}
+
 void AppListPresenterDelegate::OnMaximizeModeStarted() {
   // The "fullscreen" app-list is initialized as in a different type of window,
   // therefore we can't switch between the fullscreen status and the normal
   // app-list bubble. App-list should be dismissed for the transition between
   // maximize mode (touch-view mode) and non-maximize mode, otherwise the app
   // list tries to behave as a bubble which leads to a crash. crbug.com/510062
   if (IsFullscreenAppListEnabled() && is_visible_)
     presenter_->Dismiss();
 }
 
 void AppListPresenterDelegate::OnMaximizeModeEnded() {
   // See the comments of OnMaximizeModeStarted().
   if (IsFullscreenAppListEnabled() && is_visible_)
     presenter_->Dismiss();
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // AppListPresenterDelegate, ShelfIconObserver implementation:
 
 void AppListPresenterDelegate::OnShelfIconPositionsChanged() {
   UpdateBounds();
 }
 
 }  // namespace ash