Relate the optimus/linux blacklist entry to a crbug. BUG=131308 TEST= TBR=kbr Review URL: https://chromiumcodereview.appspot.com/10541022 git-svn-id: http://src.chromium.org/svn/trunk/deps/gpu/software_rendering_list@140688 4ff67af0-8c30-449e-8e8b-ad334ec8d88c