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This reverts commit 2c8b578a.

Reason for reland: originally reverted because the change was broken
by https://crrev.com/810801 and that change has since been reverted

Original change's description:
> [Sampling profiler] Factor out platform config 1/4
>
> First in a series factoring the ThreadProfiler platform specific
> configuration state from the code that takes action on the
> state. Defines an IsSupported function that is true if the profiler
> is supported on the chrome branding and channel for the platform.
>
> The end goal is to reduce the configuration complexity, to support
> enabling per-thread on Android.
> Bug: 1129939
> Change-Id: Ibbd6f4725804b40ac77e15aaa3bd15ad76a0e7b0
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2425165
> Reviewed-by: ssid <ssid@chromium.org>
> Reviewed-by: Etienne Pierre-Doray <etiennep@chromium.org>
> Commit-Queue: Mike Wittman <wittman@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#810835}

TBR=etiennep@chromium.org, ssid@chromium.org

Bug: 1129939
Change-Id: Ie69c5c695bc286f070e34f70553ffd35562208b9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2436250Reviewed-by: ssid <ssid@chromium.org>
Reviewed-by: Mike Wittman <wittman@chromium.org>
Reviewed-by: Etienne Pierre-Doray <etiennep@chromium.org>
Commit-Queue: Mike Wittman <wittman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811521}