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Since some iOS devices are single-core, a busy loop on one thread can
starve the thread that the test is waiting for to finish.

BUG=None
TEST=None


Review URL: https://chromiumcodereview.appspot.com/10810061

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@148087 0039d316-1c4b-4281-b951-d872f2087c98