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The goal is to avoid excessive image load requests if the backing file
gets modified multiple times in quick succession.

BUG=1139115

Change-Id: I5ecf0171d28c5c2882f660039a6923e0951ed68c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2606383Reviewed-by: David Black <dmblack@google.com>
Commit-Queue: Toni Baržić <tbarzic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#839658}