Gardening: Mark transform-interpolation.html as Slow on Debug.
Gardening: Mark transform-interpolation.html as Slow on Debug.

This test flakily timeouts or passes on Windows debug bots, but the passed
runs are also taking a long time to complete that is close to the debug time
limit (18s). So I assume the test is just slow and occasionally exceeding the
time limit.

Note that this test is marked as Timeout for Oilpan bots, but it may be due to
the similar reason. If so, this change will green up the Oilpan bots, and
the timeout expectation for Oilpan can be removed.

TBR=jianli@chromium.org, oilpan-reviews@chromium.org
BUG=377567

Review URL: https://codereview.chromium.org/1043853002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@192735 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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