Fix app to folder icon animation.

- Needed to account for the preview bounds (similar to BubbleTextView icon
  bounds)
- Also needed to update the bitmap shift amount so that it is re-centered
- Moved ShiftedBitmapDrawable to its own class in graphics package

Bug: 123900446
Change-Id: Ifa9e3f688e55d017cf86a0285f5cdb1b014f01e6

src/com/android/launcher3/Utilities.java

@@ -593,8 +593,9 @@ public final class Utilities {
         int viewLocationTop = rect.top;
 
         if (isBubbleTextView && !fromDeepShortcutView) {
-            BubbleTextView btv = (BubbleTextView) v;
-            btv.getIconBounds(rect);
+            ((BubbleTextView) v).getIconBounds(rect);
+        } else if (isFolderIcon) {
+            ((FolderIcon) v).getPreviewBounds(rect);
         } else {
             rect.set(0, 0, rect.width(), rect.height());
         }