Allow to show pinned taskbar when Launcher is visible

This CL allows freeform-first devices to lock the taskbar in a pinned
state when Launcher is visible.

Bug: 361419732
Flag: com.android.window.flags.enter_desktop_by_default_on_freeform_displays
Test: DisplayControllerTest
Test: manual

Change-Id: Ic0d2740e33fee19c676d88aa2bcf370eb64366e8

src/com/android/launcher3/util/window/WindowManagerProxy.java

@@ -121,6 +121,20 @@ public class WindowManagerProxy implements ResourceBasedOverride, SafeCloseable
         return false;
     }
 
+    /**
+     * Returns if the pinned taskbar should be shown when home is visible.
+     */
+    public boolean showLockedTaskbarOnHome(Context displayInfoContext) {
+        return false;
+    }
+
+    /**
+     * Returns if the home is visible.
+     */
+    public boolean isHomeVisible(Context context) {
+        return false;
+    }
+
     /**
      * Returns the real bounds for the provided display after applying any insets normalization
      */