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It is generated by a python test case
(TestRepaintOverlay.test_generate_repaint_overlay_html).
I should have updated it when changing repaint_overlay.py.

Updated the test to fail and print a message if the file needs an
update.

Bug: 789272
Change-Id: I2e6ba6573788177dfbc09d2bd4d3d80023d4b21f
Reviewed-on: https://chromium-review.googlesource.com/794875
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Reviewed-by: Philip Rogers <pdr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#519912}