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This CL is adding the thread id for each sampled stack event.
This will allow using multiple sampling profiler in the same process.

We are planning to sample the UI and the IO thread in the browser process.


R=ssid@chromium.org

Change-Id: Ia520c7886356fa7bf5d5f069d079125db156995d
Reviewed-on: https://chromium-review.googlesource.com/c/1310500Reviewed-by: Gabriel Charette <gab@chromium.org>
Reviewed-by: ssid <ssid@chromium.org>
Commit-Queue: Etienne Bergeron <etienneb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606557}