Make sure all group/star tiles have the same height

Old way:
- Let LinearLayout divide its width for children.
  But some children may get different width than others do, if the
  width can't be equally divided.
- Children always use the given width as height.
- So sometimes some children have different height from others.

New way:
- Do the measurement and layout by ourselves.

Bug 5149952

Change-Id: If0421138ab6d8f85fb4391fbd56dc8a75ba0ef33