Handle configuration changes in floating rotation button

Update resources in floating rotation button
when configurations such as screen density, screen size,
current locale have changed.

Bug: 200103245
Test: change display size, locale, fold/unfold
 -> check that floating rotation button resources
    are updated
Change-Id: Ia69f4f8b393a686012e286a1e39822650c562d52

quickstep/src/com/android/launcher3/taskbar/NavbarButtonsViewController.java

@@ -38,6 +38,7 @@ import android.animation.ObjectAnimator;
 import android.annotation.DrawableRes;
 import android.annotation.IdRes;
 import android.annotation.LayoutRes;
+import android.content.pm.ActivityInfo.Config;
 import android.content.res.ColorStateList;
 import android.graphics.Rect;
 import android.graphics.Region;
@@ -451,6 +452,12 @@ public class NavbarButtonsViewController {
         return mFloatingRotationButtonBounds.contains((int) ev.getX(), (int) ev.getY());
     }
 
+    public void onConfigurationChanged(@Config int configChanges) {
+        if (mFloatingRotationButton != null) {
+            mFloatingRotationButton.onConfigurationChanged(configChanges);
+        }
+    }
+
     public void onDestroy() {
         mPropertyHolders.clear();
         mControllers.rotationButtonController.unregisterListeners();