CrOS Alt+Tab UI: no-op when UI is aborted (instead of switching window).

ash/common/wm/window_cycle_controller.h

Index: ash/common/wm/window_cycle_controller.h
diff --git a/ash/common/wm/window_cycle_controller.h b/ash/common/wm/window_cycle_controller.h
index 4544f492458dbf568c0c60a95ed35fd0b223b265..87eedd9a2140bd127d822924373f999bb1e67592 100644
--- a/ash/common/wm/window_cycle_controller.h
+++ b/ash/common/wm/window_cycle_controller.h
@@ -45,10 +45,14 @@ class ASH_EXPORT WindowCycleController {
   // listen to the alt key release.
   void StartCycling();
 
-  // Stops the current window cycle and removes the event filter.
-  void StopCycling();
-
-  // Returns the WindowCycleList. Really only useful for testing.
+  // Both of these functions stop the current window cycle and removes the event
+  // filter. The former indicates success (i.e. the new window should be
+  // activated) and the latter indicates that the interaction was cancelled (and
+  // the originally active window should remain active).
+  void CompleteCycling();
+  void CancelCycling();
+
+  // Returns the WindowCycleList.
   const WindowCycleList* window_cycle_list() const {
     return window_cycle_list_.get();
   }
@@ -57,6 +61,8 @@ class ASH_EXPORT WindowCycleController {
   // Cycles to the next or previous window based on |direction|.
   void Step(Direction direction);
 
+  void StopCycling();
+
   std::unique_ptr<WindowCycleList> window_cycle_list_;
 
   // Tracks what Window was active when starting to cycle and used to determine