[cpu-profiler] Refactor SamplingEventsProcessor into base and subclass
This is preparation to allow for a non-sampling events processor which receives ticks from a source not driven by a timer. This will allow us to have more deterministic testing of the CPU profiler. It also allows different implementations for a wall time and CPU time triggered sampler. Change-Id: I2e9db9580ec70f05094e59c2c1e5efc28c8f7da8 Reviewed-on: https://chromium-review.googlesource.com/c/1280436Reviewed-by: Yang Guo <yangguo@chromium.org> Commit-Queue: Peter Marshall <petermarshall@chromium.org> Cr-Commit-Position: refs/heads/master@{#56717}
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