Draggable peeking/fullscreen launcher with transparent background.

ui/app_list/views/app_list_main_view.h

Index: ui/app_list/views/app_list_main_view.h
diff --git a/ui/app_list/views/app_list_main_view.h b/ui/app_list/views/app_list_main_view.h
index 937a5dd271615da87d90a0c8d0c8fc3b35fd8a24..c3fafa6ee22b127da0521c9142ffb46f8e27cfdb 100644
--- a/ui/app_list/views/app_list_main_view.h
+++ b/ui/app_list/views/app_list_main_view.h
@@ -12,6 +12,7 @@
 #include "base/timer/timer.h"
 #include "ui/app_list/app_list_export.h"
 #include "ui/app_list/app_list_model_observer.h"
+#include "ui/app_list/views/app_list_view.h"
 #include "ui/app_list/views/apps_grid_view_delegate.h"
 #include "ui/app_list/views/search_box_view_delegate.h"
 #include "ui/app_list/views/search_result_list_view_delegate.h"
@@ -35,7 +36,8 @@ class APP_LIST_EXPORT AppListMainView : public views::View,
                                         public SearchBoxViewDelegate,
                                         public SearchResultListViewDelegate {
  public:
-  explicit AppListMainView(AppListViewDelegate* delegate);
+  explicit AppListMainView(AppListViewDelegate* delegate,
+                           AppListView* app_list_view);
   ~AppListMainView() override;
 
   void Init(gfx::NativeView parent,
@@ -99,6 +101,7 @@ class APP_LIST_EXPORT AppListMainView : public views::View,
   // Created by AppListView. Owned by views hierarchy.
   SearchBoxView* search_box_view_;
   ContentsView* contents_view_;  // Owned by views hierarchy.
+  AppListView* const app_list_view_;  // Owned by views hierarchy.
 
   DISALLOW_COPY_AND_ASSIGN(AppListMainView);
 };