Exposing some private methods in FastBitmapDrawable

Bug: 109858110
Change-Id: Ica07426cb413876d90a1b8ff49645c4711e15fc9
diff --git a/src/com/android/launcher3/FastBitmapDrawable.java b/src/com/android/launcher3/FastBitmapDrawable.java
index 1b91e88..9217ca9 100644
--- a/src/com/android/launcher3/FastBitmapDrawable.java
+++ b/src/com/android/launcher3/FastBitmapDrawable.java
@@ -261,7 +261,7 @@
     /**
      * Updates the paint to reflect the current brightness and saturation.
      */
-    private void updateFilter() {
+    protected void updateFilter() {
         boolean usePorterDuffFilter = false;
         int key = -1;
         if (mDesaturation > 0) {