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As StagingbufferPool and ResourcePool, SoftwareImageDecodeCache has been
only supporting the MemoryCoordinator. However, it is not enabled by
default. So it would be good if we support the memory pressure handler
until the MemoryCoordinator is enabled by default. Especially, it will
help low-end devices to reduce memory usage under the out-of-memory
situation.

Bug: 856527
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I0aace1839b9d0e056f1a2db18f5d9e652c742c5f
Reviewed-on: https://chromium-review.googlesource.com/1122016Reviewed-by: Eric Karl <ericrk@chromium.org>
Commit-Queue: Gyuyoung Kim <gyuyoung.kim@lge.com>
Cr-Commit-Position: refs/heads/master@{#572154}