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/TaskbarAllAppsController.java

@@ -144,9 +144,7 @@ public final class TaskbarAllAppsController {
         // to catch invalid states.
         mControllers.getSharedState().allAppsVisible = true;
 
-        mAllAppsContext = new TaskbarAllAppsContext(mTaskbarContext,
-                this,
-                mControllers.taskbarStashController);
+        mAllAppsContext = new TaskbarAllAppsContext(mTaskbarContext, this, mControllers);
         mAllAppsContext.getDragController().init(mControllers);
         TaskStackChangeListeners.getInstance().registerTaskStackListener(mTaskStackListener);
         Optional.ofNullable(mAllAppsContext.getSystemService(WindowManager.class))