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This avoids clearing some longer-lived Skia caches, hopefully avoiding
an UMA latency regression we experienced when the idle clearing was
initially added.

This re-land uses a more direct Skia API, hopefully avoiding the
flakiness seen in issue 805575.

Note for sheriffs: We expect a small regression in measured memory.
This is intentional, and comes with an improvement to input latency.
This regression shouldn't have a large impact on real-world scenarios,
as we are preventing the clearing of a cache that will be immediately
re-created on any page raster.

TBR=brettw@chromium.org for test-only DEPS change (already ran by bsalomon@ in previous patch, this is re-land+updates)

Bug: 664181, 805575
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel
Change-Id: Id4c9a091a543c31f928e0214558695de81a30e9d
Reviewed-on: https://chromium-review.googlesource.com/1123169
Commit-Queue: Eric Karl <ericrk@chromium.org>
Reviewed-by: Khushal <khushalsagar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#572391}