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Currently, the transfer cache has a large (128MB) memory limit, but no
limit on individual entries. As we have the potential to flood the
cache with thousands of small entries, causing an explosion of handle
allocations, I've added a 2000 element cap.

Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I1245220bca1ea47546be7d28eaea2e494e3468db
Reviewed-on: https://chromium-review.googlesource.com/1147311Reviewed-by: Khushal <khushalsagar@chromium.org>
Commit-Queue: Eric Karl <ericrk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577312}