GitLab

Currently we limit GPU Image Decode Cache working set by bytes, but
this allows the cache to be filled with thousands of working set
entries if sufficiently small. This ends up causing negative
performance and memory spikes vs flushing more regularly.

This change adds a 256 item limit to the GPU IDC working set, avoiding
the worst of these issues.

Bug: 870455
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I0e6f27d3cb070ea3c29940ce9aad61224a3120cf
Reviewed-on: https://chromium-review.googlesource.com/1179378
Commit-Queue: Eric Karl <ericrk@chromium.org>
Reviewed-by: Khushal <khushalsagar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584286}