Draggable peeking/fullscreen launcher with transparent background.

ui/app_list/views/all_apps_tile_item_view.h

Index: ui/app_list/views/all_apps_tile_item_view.h
diff --git a/ui/app_list/views/all_apps_tile_item_view.h b/ui/app_list/views/all_apps_tile_item_view.h
index a3cf94b987fa92496763b91eccaf6935e0bdd60b..bf8706beb984e09a59b748aa646a4600e9f381ae 100644
--- a/ui/app_list/views/all_apps_tile_item_view.h
+++ b/ui/app_list/views/all_apps_tile_item_view.h
@@ -7,6 +7,7 @@
 
 #include <vector>
 
+#include "ui/app_list/views/app_list_view.h"
 #include "ui/app_list/views/tile_item_view.h"
 
 namespace app_list {
@@ -16,7 +17,8 @@ class ContentsView;
 // A tile item for the "All apps" button on the start page.
 class AllAppsTileItemView : public TileItemView {
  public:
-  explicit AllAppsTileItemView(ContentsView* contents_view);
+  explicit AllAppsTileItemView(ContentsView* contents_view,
+                               AppListView* app_list_view);
 
   ~AllAppsTileItemView() override;
 
@@ -27,6 +29,7 @@ class AllAppsTileItemView : public TileItemView {
 
  private:
   ContentsView* contents_view_;
+  AppListView* const app_list_view_;  // Owned by the views hierarchy.
 
   DISALLOW_COPY_AND_ASSIGN(AllAppsTileItemView);
 };