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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/+/2425165Reviewed-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}