Enlarge wifi signal icon from 24dp to 32dp for header view

Bug: 129413562
Test: manual test
Change-Id: I50a27ac25e5ae42530736bb7c019485a51d707ba
diff --git a/src/com/android/settings/Utils.java b/src/com/android/settings/Utils.java
index 36230d1..0938c09 100644
--- a/src/com/android/settings/Utils.java
+++ b/src/com/android/settings/Utils.java
@@ -977,7 +977,10 @@
         return IconCompat.createWithBitmap(bitmap);
     }
 
-    private static Bitmap createBitmap(Drawable drawable, int width, int height) {
+    /**
+     * Creates a drawable with specified width and height.
+     */
+    public static Bitmap createBitmap(Drawable drawable, int width, int height) {
         final Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
         final Canvas canvas = new Canvas(bitmap);
         drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());