Fix Blank task thumbnails during animation in following scenarios

1. During split
2. During dismiss

We need to expand window of visible task data, we use dismissTranslation property to increase window.

Fix: 376409147
Flag: EXEMPT bugfix
Test: Manual: Dismiss desktop when have focus task as well as small tiles, split from far away with multiple desktops
Change-Id: I0102f8927e70a37ffe4db18adefd33eb7a823981