Add lookup flag validation check.

Checks existence of Glyph class definition table in GDEF table if bits of lookup flags which require the table are set.

BUG=76943
TEST=test/layout_common_table_test.cc



git-svn-id: http://ots.googlecode.com/svn/trunk@59 a4e77c2c-9104-11de-800e-5b313e0d2bf3
4 files changed