Show scrim immediately when animating to overview from app through KQS

Flag: LEGACY ENABLE_KEYBOARD_QUICK_SWITCH ENABLED
Fixes: 324888882
Test: opened overview from app/home with finger swipe/KQS/overview button
Change-Id: Ia4a15f5a64956ec56fc9aae3511173219616245e

quickstep/src/com/android/quickstep/BaseActivityInterface.java

@@ -408,11 +408,14 @@ public abstract class BaseActivityInterface<STATE_TYPE extends BaseState<STATE_T
             if (activity == null) {
                 return null;
             }
+            RecentsView recentsView = activity.getOverviewPanel();
             STATE_TYPE state = stateFromGestureEndTarget(endTarget);
             ScrimView scrimView = activity.getScrimView();
             ObjectAnimator anim = ObjectAnimator.ofArgb(scrimView, VIEW_BACKGROUND_COLOR,
                     getOverviewScrimColorForState(activity, state));
             anim.setDuration(duration);
+            anim.setInterpolator(recentsView == null || !recentsView.isKeyboardTaskFocusPending()
+                    ? LINEAR : INSTANT);
             return anim;
         }
         return null;