Cros: Use transforms for animations in cardified state

When entering or exiting cardfified state, we now use transforms for app
icons so that animations run smoothier and in a more controlled way.

Bug: 1108643
Change-Id: Ib3d0728e62bc360b98c04910ea9793eb39dc1b40
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2335556
Commit-Queue: Ana Salazar <anasalazar@chromium.org>
Reviewed-by: Toni Baržić <tbarzic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#795771}

ash/app_list/views/apps_grid_view.h

@@ -12,6 +12,7 @@
 #include <sstream>
 #include <string>
 #include <tuple>
+#include <vector>
 
 #include "ash/app_list/app_list_export.h"
 #include "ash/app_list/model/app_list_model.h"
@@ -47,7 +48,7 @@ namespace ash {
 namespace test {
 class AppsGridViewTest;
 class AppsGridViewTestApi;
-}
+}  // namespace test
 
 class ApplicationDragAndDropHost;
 class AppListConfig;
@@ -317,6 +318,8 @@ class APP_LIST_EXPORT AppsGridView : public views::View,
   void RemoveBackgroundCard();
   // Masks the apps grid container to background cards bounds.
   void MaskContainerToBackgroundBounds();
+  // Removes all background cards from |background_cards_|.
+  void RemoveAllBackgroundCards();
 
   // Return the view model.
   views::ViewModelT<AppListItemView>* view_model() { return &view_model_; }
@@ -539,6 +542,9 @@ class APP_LIST_EXPORT AppsGridView : public views::View,
   void OnBoundsAnimatorProgressed(views::BoundsAnimator* animator) override;
   void OnBoundsAnimatorDone(views::BoundsAnimator* animator) override;
 
+  // Call OnBoundsAnimatorDone when all layer animations finish.
+  void MaybeCallOnBoundsAnimatorDone();
+
   // Hide a given view temporarily without losing (mouse) events and / or
   // changing the size of it. If |immediate| is set the change will be
   // immediately applied - otherwise it will change gradually.
@@ -918,6 +924,10 @@ class APP_LIST_EXPORT AppsGridView : public views::View,
   // card during cardified state.
   std::vector<std::unique_ptr<ui::Layer>> background_cards_;
 
+  int bounds_animation_for_cardified_state_in_progress_ = 0;
+
+  base::WeakPtrFactory<AppsGridView> weak_ptr_factory_{this};
+
   DISALLOW_COPY_AND_ASSIGN(AppsGridView);
 };