harfbuzz: Add Behdad's patch to fix Thai crashes on Linux.
harfbuzz: Add Behdad's patch to fix Thai crashes on Linux.

This appears to prevent some renderer crashes that are
fairly easy to trigger with Thai pages on Chrome OS.

BUG=chromium:75210,chromium-os:15103
TEST=manual: built chromeos-chrome and checked that http://www.pungame.com/sale.html and http://happy.teenee.com/game/ no longer cause crashes

Review URL: http://codereview.chromium.org/7000012

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@84890 0039d316-1c4b-4281-b951-d872f2087c98

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