Fix black flicker when closing IME

When closing the IME in docked adjusted mode, we still need to pass
in the IME window so we can still execute the logic to delay starting
the animation, so we don't see a black hole before the animation is
started.

Bug: 28175599
Change-Id: I606d30bd63b5e909fdebd78b0aa4968bd9f26c24

services/core/java/com/android/server/wm/WindowManagerService.java

@@ -7498,7 +7498,7 @@ public class WindowManagerService extends IWindowManager.Stub
                 stack.resetAdjustedForIme(!dockVisible);
             }
             displayContent.mDividerControllerLocked.setAdjustedForIme(
-                    false /*ime*/, false /*divider*/, dockVisible /*animate*/, null);
+                    false /*ime*/, false /*divider*/, dockVisible /*animate*/, imeWin);
         }
     }