Enable paint cache for media slider when not checking under-invalidation
The under-invalidation does no real harm except for delayed paint when buffered ranges change in paused mode. This improves performance of media control painting which may help crbug.com/633036. BUG=484288 CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2 Review-Url: https://codereview.chromium.org/2297453002 Cr-Commit-Position: refs/heads/master@{#415305}
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