Turn on GPU layout tests on the experimental bots.
Turn on GPU layout tests on the experimental bots.

    BUG=58838
    R=maruel
    TEST=GPU layout tests start running on the bots

Review URL: http://codereview.chromium.org/4145010

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@64342 0039d316-1c4b-4281-b951-d872f2087c98

eunchong/build,eunchong/build,eunchong/build,eunchong/build