Disable threaded tests on Valgrind to see if that's enough.

Even if we don't stick with this, it'd be good to know whether
it's enough to fix our timeout problem.

BUG=skia:3021

Review URL: https://codereview.chromium.org/658583002

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/build@292461 0039d316-1c4b-4281-b951-d872f2087c98
2 files changed