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LogMemory() calls memory::OomMemoryDetails::Log(), which is an async
call and may take a long time (only 60% returns < 1s, 10% returns > 5s).
When we're running out of memory, we need to discard tab faster.

BUG=850545

Change-Id: Ia652b2a80f968b0e437904bb6bc2c7c131c1958d
Reviewed-on: https://chromium-review.googlesource.com/1097038Reviewed-by: Cheng-Yu Lee <cylee@chromium.org>
Reviewed-by: Trent Apted <tapted@chromium.org>
Reviewed-by: Erik Chen <erikchen@chromium.org>
Reviewed-by: François Doray <fdoray@chromium.org>
Commit-Queue: Cheng-Yu Lee <cylee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567891}