Fix fast/repaint/block-layout-inline-children-replaced.html

Fix fast/repaint/block-layout-inline-children-replaced.html

The test was loading an image but didn't wait for the image
to fully load to get all the invalidations generated. The
extra 2 invalidations come from the image (92 x 100)
and its container (402 x 100).

The fix involves allowing our invalidation harness to
run asynchronously. While touching the code, removed
some unneeded window-prefix.

BUG=313447
R=jamesr@chromium.org

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=168491

[eseidel, 2014-03-04 08:59:30]

James has been in this code more recently than I.

[jamesr, 2014-03-04 20:22:07]

lgtm

most tests have their resources in the document at DOMContentLoaded time and
just call runRepaintTest in window.load, but this one's dynamically adding more
resources. make sense.

[Julien - ping for review, 2014-03-04 21:15:39]

The CQ bit was checked by jchaffraix@chromium.org

[commit-bot: I haz the power, 2014-03-04 21:16:37]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/jchaffraix@chromium.org/184213004/20001

[Julien - ping for review, 2014-03-04 22:40:00]

The CQ bit was checked by jchaffraix@chromium.org

[commit-bot: I haz the power, 2014-03-04 22:40:12]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/jchaffraix@chromium.org/184213004/40001

[Julien - ping for review, 2014-03-05 15:52:14]

Committed patchset #3 manually as r168491 (presubmit successful).