Added suppressions for flaky failures and possibly expected failures.
Added suppressions for flaky failures and possibly expected failures.

BUG=374936,376432
TBR=alph@chromium.org

Review URL: https://codereview.chromium.org/292813010

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@174590 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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