Gardening: Mark animated-composited-inside-hidden.html flaky
Gardening: Mark animated-composited-inside-hidden.html flaky

TBR=dstockwell@chromium.org, steveblock@chromium.org
BUG=349552

Review URL: https://codereview.chromium.org/183023015

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@168523 bbb929c8-8fbe-4397-9dbb-9b2b20218538

primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs