[OTS] Strictly check table padding for WOFF files

Checks table boundaries strictly in the WOFF path in compliance with the spec.
This CL make OTS pass all W3C WOFF "User Agent" tests.
I also checked the CL doesn't reject the takao TTF fonts, which don't have
zero-padding in the last table.

BUG=chromium:109813,chromium:47960
TEST=ran test_{un,}malicious_fonts.sh
Review URL: https://chromiumcodereview.appspot.com/10518005

git-svn-id: http://ots.googlecode.com/svn/trunk@92 a4e77c2c-9104-11de-800e-5b313e0d2bf3
1 file changed