fix regression in fallback chain where we don't account for the original font style.

This CL also enforces that the language and variant are the same for all fonts
within a given fallback family.

R=reed@google.com

Review URL: https://codereview.chromium.org/23670009

git-svn-id: http://skia.googlecode.com/svn/trunk@11128 2bbb7eff-a529-9590-31e7-b0007b416f81
1 file changed