Remove relayouts

b/29945805

> Workspace relayout occurs when window flag is set to
change the status bar. This should not cause AllAppsTransitionController
to be initialized.
> Setting/Unsetting background drawables on the hotseat
also causes unnecessary layout. Fix this issue.

Change-Id: I73a3bfd3eb4bc34cf6760ffbd9826e3fef867056

src/com/android/launcher3/allapps/AllAppsTransitionController.java

@@ -444,5 +444,6 @@ public class AllAppsTransitionController implements TouchController, VerticalPul
         if (!mLauncher.isAllAppsVisible()) {
             setProgress(mShiftRange);
         }
+        mHotseat.removeOnLayoutChangeListener(this);
     }
 }