Properly color taskbar nav buttons when slide-in view is shown.

Supports overriding the current nav bar color with one that would be
visible over a slide-in view.

Demo:
https://drive.google.com/file/d/1MB26QM5qeeyVB6Bj14IGoPCWVT_P7K-3/view?usp=sharing&resourcekey=0-wnMgciNrUXC_l7gI3JFm8A

Test: Manually with light and dark themes, as well as All Apps and EDU
views.
Fix: 248359789

Change-Id: I134ae719b10f3de78ea18220a835de56a82ecb02

quickstep/src/com/android/launcher3/taskbar/allapps/TaskbarAllAppsViewController.java

@@ -22,6 +22,8 @@ import static com.android.launcher3.util.OnboardingPrefs.ALL_APPS_VISITED_COUNT;
 import com.android.launcher3.AbstractFloatingView;
 import com.android.launcher3.appprediction.AppsDividerView;
 import com.android.launcher3.appprediction.PredictionRowView;
+import com.android.launcher3.taskbar.NavbarButtonsViewController;
+import com.android.launcher3.taskbar.TaskbarControllers;
 import com.android.launcher3.taskbar.TaskbarStashController;
 
 /**
@@ -34,17 +36,19 @@ final class TaskbarAllAppsViewController {
     private final TaskbarAllAppsSlideInView mSlideInView;
     private final TaskbarAllAppsContainerView mAppsView;
     private final TaskbarStashController mTaskbarStashController;
+    private final NavbarButtonsViewController mNavbarButtonsViewController;
 
     TaskbarAllAppsViewController(
             TaskbarAllAppsContext context,
             TaskbarAllAppsSlideInView slideInView,
             TaskbarAllAppsController windowController,
-            TaskbarStashController taskbarStashController) {
+            TaskbarControllers taskbarControllers) {
 
         mContext = context;
         mSlideInView = slideInView;
         mAppsView = mSlideInView.getAppsView();
-        mTaskbarStashController = taskbarStashController;
+        mTaskbarStashController = taskbarControllers.taskbarStashController;
+        mNavbarButtonsViewController = taskbarControllers.navbarButtonsViewController;
 
         setUpIconLongClick();
         setUpAppDivider();
@@ -83,7 +87,9 @@ final class TaskbarAllAppsViewController {
         mTaskbarStashController.updateStateForFlag(FLAG_STASHED_IN_APP_ALL_APPS, true);
         mTaskbarStashController.applyState(
                 ALL_APPS.getTransitionDuration(mContext, true /* isToState */));
+        mNavbarButtonsViewController.setSlideInViewVisible(true);
         mSlideInView.setOnCloseBeginListener(() -> {
+            mNavbarButtonsViewController.setSlideInViewVisible(false);
             AbstractFloatingView.closeOpenContainer(
                     mContext, AbstractFloatingView.TYPE_ACTION_POPUP);
             // Post in case view is closing due to gesture navigation. If a gesture is in progress,