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This interface exports the function provided by the chromeos memory
pressure module in //chromeos/memory/pressure/. This interface will be
used by chrome, CrOS VM and ARCVM to query system memory pressure
status. The clients of this interface shall try to release memory when
the memory pressure is high.

BUG=b:149833548
Test: dbus-send --system --type=method_call --print-reply \
    --dest=org.chromium.MemoryPressure /org/chromium/MemoryPressure \
    org.chromium.MemoryPressure.GetAvailableMemoryKB

Change-Id: I795b688433ef8c5ab58a7d2099f369655f7b41c8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2409423Reviewed-by: Jorge Lucangeli Obes <jorgelo@chromium.org>
Reviewed-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@{#807548}