Use mojo app list interfaces for mash and classic ash.

ui/app_list/presenter/app_list_presenter_impl.cc

Index: ui/app_list/presenter/app_list_presenter_impl.cc
diff --git a/ui/app_list/presenter/app_list_presenter_impl.cc b/ui/app_list/presenter/app_list_presenter_impl.cc
index e6db16a76d1a001b89936e5dee210b80e819e52d..21b0414fd47181ce1301f60364f8565d14ec9588 100644
--- a/ui/app_list/presenter/app_list_presenter_impl.cc
+++ b/ui/app_list/presenter/app_list_presenter_impl.cc
@@ -57,6 +57,9 @@ void AppListPresenterImpl::Show(int64_t display_id) {
     return;
 
   is_visible_ = true;
+  if (app_list_)
+    app_list_->OnTargetVisibilityChanged(GetTargetVisibility());
+
   if (view_) {
     ScheduleAnimation();
   } else {
@@ -80,6 +83,8 @@ void AppListPresenterImpl::Dismiss() {
   DCHECK(view_);
 
   is_visible_ = false;
+  if (app_list_)
+    app_list_->OnTargetVisibilityChanged(GetTargetVisibility());
 
   // The dismissal may have occurred in response to the app list losing
   // activation. Otherwise, our widget is currently active. When the animation
@@ -110,6 +115,14 @@ bool AppListPresenterImpl::GetTargetVisibility() const {
   return is_visible_;
 }
 
+void AppListPresenterImpl::SetAppList(mojom::AppListPtr app_list) {
+  DCHECK(app_list);
+  app_list_ = std::move(app_list);
+  // Notify the app list interface of the current [target] visibility.
+  app_list_->OnTargetVisibilityChanged(GetTargetVisibility());
+  app_list_->OnVisibilityChanged(IsVisible());
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // AppListPresenterImpl, private:
 
@@ -211,12 +224,19 @@ void AppListPresenterImpl::OnImplicitAnimationsCompleted() {
 // AppListPresenterImpl, views::WidgetObserver implementation:
 
 void AppListPresenterImpl::OnWidgetDestroying(views::Widget* widget) {
-  DCHECK(view_->GetWidget() == widget);
+  DCHECK_EQ(view_->GetWidget(), widget);
   if (is_visible_)
     Dismiss();
   ResetView();
 }
 
+void AppListPresenterImpl::OnWidgetVisibilityChanged(views::Widget* widget,
+                                                     bool visible) {
+  DCHECK_EQ(view_->GetWidget(), widget);
+  if (app_list_)
+    app_list_->OnVisibilityChanged(visible);
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // AppListPresenterImpl, PaginationModelObserver implementation: