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This is a reland of aa63fc1d.

Original change's description:
> Encapsulate Chrome thread profiling setup into a single class
>
> Creates a simple abstraction around the fairly complex profiling setup.
> This CL switches over the GPU and renderer process usage to this class.
> The browser process usage will be converted to use this class after it
> is extended to support periodic profiling (in a follow-on CL).
>
> Bug: 808588
> Change-Id: I6195571bf3ddd08291f288f475569bd9a88795ef
> Reviewed-on: https://chromium-review.googlesource.com/905451
> Reviewed-by: Scott Violet <sky@chromium.org>
> Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
> Commit-Queue: Mike Wittman <wittman@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#535125}

TBR=sky

Bug: 808588
Change-Id: I34f1910116c4e7a500e353c27b85bf7534be43c7
Reviewed-on: https://chromium-review.googlesource.com/907508Reviewed-by: Mike Wittman <wittman@chromium.org>
Commit-Queue: Mike Wittman <wittman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#535170}