Provide last resort for fCapHeight in SkFontHost_FreeType::onGetAdvancedTypefaceMetrics.

This was a pre-existing issue, but r12689 uncovered it in more cases.
Since there was no last resort, fonts without a cap height used
uninitialized data as their cap height here.

R=robertphillips@google.com

Review URL: https://codereview.chromium.org/114773004

git-svn-id: http://skia.googlecode.com/svn/trunk@12779 2bbb7eff-a529-9590-31e7-b0007b416f81
1 file changed