Use pointer width from res before getWidth is ready

Fix bug where the first time that bubble stack expands
-mPointerView.getWidth() returns 0 while mPointerView is being created
-setPointerPosition adjusts pointer position by 0
-pointer points to right of center

Also
-replace mPointerView.getHeight() with mPointerHeight
-remove unused getExpandedSize()

Bug: 131849856
Test: manual
Change-Id: I433cf7755152e49c2f8a2fd3df0b70c6dd079b57