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When the v8.cpu_profiler tracing category is enabled
it starts generating V8Sample events with stack frames and
V8 state.

LockFreeCircularQueue template is taken from V8.

Android and Windows support will be coming.

BUG=406277

Review URL: https://codereview.chromium.org/1017063002

Cr-Commit-Position: refs/heads/master@{#321565}