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We currently unlock pre-decoded images after 2 frames of any type. This
doesn't always give callers a chance to use their images (if main thread
is a bit backed up). Instead we should wait for the caller to actually
use the image. Additionally, we drop images after 250ms to prevent
excessive growth if a user fails to use images in a timely manner.

See the linked bug for example traces which show the benefits.

R=khushalsagar

Bug: 869491
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: Icd94709aad5c076b1ba295495eaab24dc893ebdb
Reviewed-on: https://chromium-review.googlesource.com/1159203
Commit-Queue: Eric Karl <ericrk@chromium.org>
Reviewed-by: Khushal <khushalsagar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583171}