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This CL sets the soft limit at 0 when we are in CRITICAL memory
pressure. This enforces sync and cleanup in every submit call to
reduce memory usage spikes.

This CL only affects platforms that have soft limit. That happens
if --vulkan-sync-cpu-memory-limit-mb flag is set, which is only
enabled on fuchsia.

Bug: 1166839

Change-Id: I9d38cba2479a8c912d6b1e1624e9f893be8188de
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2629573
Commit-Queue: Emircan Uysaler <emircan@chromium.org>
Reviewed-by: kylechar <kylechar@chromium.org>
Reviewed-by: Vasiliy Telezhnikov <vasilyt@chromium.org>
Reviewed-by: David Reveman <reveman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#845162}