Update expectations to green the tree.
Update expectations to green the tree.

-Add flaky tests from https://codereview.chromium.org/262963003.
A revert would be tricky.
-Rebaseline fast/transforms/shadows.html as a followup to
https://codereview.chromium.org/279513002.
-Add a flaky imports test.

TBR=loislo@chromium.org,enne@chromium.org,morrita@chromium.org

Review URL: https://codereview.chromium.org/279663002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@173698 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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