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In the following few cases we intentionally allow under-invalidations in
cached subsequences:
- offscreen image animation
- media buffered range

We intentionally don't update each time the contents change to improve
performance or avoid complex implementation of real time change
notification.

Now allow cache skipping in cached subsequences.

Enable under-invalidation checking for tests that would have reported
under-invalidation with the checking enabled.

This also helps clusterfuzz not to trigger under-invaldiation checking
failures when it creates a test for the above cases.

Bug: 769729
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
Change-Id: I2149e9d2304dbad5d7486c822d5452c5dba237fe
Reviewed-on: https://chromium-review.googlesource.com/690851
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#505281}