Gardening: mark virtual/threaded/animations/animation-controller-drt-api.html as flaky.
Gardening: mark virtual/threaded/animations/animation-controller-drt-api.html as flaky.

TBR=

Review URL: https://codereview.chromium.org/17447014

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@152783 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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