Ellipsize avoids spaces and starts right after text

Bug 5509226

Change ellipsize bounds to take spaces into account

The hardcoded ' ' character may be problematic with other langages.

Note that a different ellipsize logic also exists in StaticLayout.
Created 6062415 to track this.

Change-Id: I3406ec23a592f952bf3e0ca68f0838ee807baba0