Adding a manual test to verify canvas update with setTimeout
Adding a manual test to verify canvas update with setTimeout

Adding a test to verify that animated canvases have their screen
invalidations properly propagated when using setTimeout.
The final update before grabbing pixel results prevents the layout
test harness from being able to capture this bug.

BUG=453602
R=senorblanco@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/883353007

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@189280 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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