Draggable peeking/fullscreen launcher with transparent background.

ash/shelf/shelf.h

Index: ash/shelf/shelf.h
diff --git a/ash/shelf/shelf.h b/ash/shelf/shelf.h
index af21bc46767b898b04cd986f14720da213d0bb4c..133ea8049c4652fcadfef370140c28c41481ec81 100644
--- a/ash/shelf/shelf.h
+++ b/ash/shelf/shelf.h
@@ -135,6 +135,10 @@ class ASH_EXPORT Shelf : public ShelfLayoutManagerObserver {
   ShelfLockingManager* GetShelfLockingManagerForTesting();
   ShelfView* GetShelfViewForTesting();
 
+  // Notifies ShelfLayoutManager that the app list is active in order to

[vadimt, 2017/05/26 01:27:56]

You either call it NotifyXXX and keep the comment or leave the name as OnXXX,
and change the comment to "called when XXX".

[newcomer, 2017/05/26 17:11:27]

Done.

+  // restrict the background behavior.
+  void OnAppListIsActive(bool hideBackground);
+
  protected:
   // ShelfLayoutManagerObserver:
   void WillDeleteShelfLayoutManager() override;