Add suppressions for flaky compositing/layer-creation tests.
Add suppressions for flaky compositing/layer-creation tests.

TBR=vollick@chromium.org
BUG=321358

Review URL: https://codereview.chromium.org/76893002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@162319 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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