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CastSystemMemoryPressureEvaluator can accept requests from apps
to relax memory pressure thresholds. Normal memory pressure thresholds
can be restored when those apps quit.

Bug: internal b/141100797
Test: Build and run with eureka-internal/316737.

Merge-With: eureka-internal/316737

Change-Id: I6752297ef1ea25e5e28965f00ad6cb04db194a29
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1816729Reviewed-by: Luke Halliwell <halliwell@chromium.org>
Reviewed-by: Kenneth MacKay <kmackay@chromium.org>
Commit-Queue: Guohui Deng <guohuideng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#700922}