cc: Interface to evict images from cc image decode cache.

This adds interface to enable eviction of images from
image decode cache in cc. This CL sets up the interface
and eviction logic in gpu image decode cache. A follow
up would handle the sw cache eviction.

BUG=730784
CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_trusty_blink_rel

Review-Url: https://codereview.chromium.org/2945813002
Cr-Commit-Position: refs/heads/master@{#480961}
8 files changed