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This reduces the average PCScan time on the renderer process (with PA as
a malloc) from 269ms to 29ms (9x).

Bug: 11297512
Change-Id: I445f609751e25d943ed779453aa07a0142cbf5b0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2498464
Commit-Queue: Anton Bikineev <bikineev@chromium.org>
Reviewed-by: Bartek Nowierski <bartekn@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821696}