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These resources are mostly scratch space. As per crbug.com/899940:

- most of this is scratch space textures for intermediate results cached
  to avoid GPU memory churn

- with the UI using OOP-R we don't go idle as often (e.g. cursor blink,
  throbber)

- 15 seconds is a long time to keep it around (many of our regression
  tests don't run this long)

Bug: 899940
Change-Id: Idc077c98551978afa97b18be3dd61784f8898806
Reviewed-on: https://chromium-review.googlesource.com/c/1320790Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Jonathan Backer <backer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608579}