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The stack sampling implementations for Linux and Android platforms require
the pthread_t type to obtain the stack base address, in addition to the
PlatformThreadId. This change introduces a minimal ThreadToken abstraction
that encapsulates the necessary thread state across platforms.

TBR=gab@chromium.org

Bug: 988579
Change-Id: Ie5d70709ddae362ca414dc5a635e456c8bd9f8ad
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1860151Reviewed-by: Mike Wittman <wittman@chromium.org>
Reviewed-by: ssid <ssid@chromium.org>
Reviewed-by: Gabriel Charette <gab@chromium.org>
Reviewed-by: Charlie Andrews <charliea@chromium.org>
Commit-Queue: Mike Wittman <wittman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709061}