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This adds a global CHECK that ensures we hopefully won't miss new processes as
they are added.

This enables all processes to initialize system tracing as early as possible.

Bug: 979576
Change-Id: Id9d841dad5980cf82e46586238fe682722558cea
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1748886
Commit-Queue: Stephen Nusko <nuskos@chromium.org>
Commit-Queue: Eric Seckler <eseckler@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Eric Seckler <eseckler@chromium.org>
Auto-Submit: Stephen Nusko <nuskos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#686469}