n#870234: Import gradfill for text colors.

Uses the first color from the gradfill list.
(Which is better than plain black!)

Change-Id: I4c1c0c4b031f3681c95b75b3c0683eb4de95bffb
Add unit test for text gradfill import.

Change-Id: I803238fd21d1c73aae8146966a5e62e62ad48c5c