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Implement CriticalMemoryPressure and ModerateMemoryPressure signals.
Rename kGetMemoryMarginKBMethod to kGetMemoryMarginsKBMethod.

Bug: b/149833548
Change-Id: Id7655695e565638fe34a2f7c3bb7cdac79039725
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2532158Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Brian Geffon <bgeffon@chromium.org>
Commit-Queue: Kuo-Hsin Yang <vovoy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826831}