- Created status enum with statuses kStarted, kAlreadyStarted and
kErrorTooManyProfilers, returning when StartProfiling is invoked
 - Tests spin up one profiler, check kStarted returned; spin up
another with same name, check kAlreadyStarted returned; Spin up 99
more profilers (100 total), check each returning kStarted, and
one more, expecting 101st to return kErrorTooManyProfilers

R=acomminos@fb.com, petermarshall@chromium.org, ulan@chromium.org

Change-Id: I64e2e6396775f90f9f49f75331a075a47efa7fca
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2486240Reviewed-by: Peter Marshall <petermarshall@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#70808}