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This CL adds support of stopping a perf session in PerfOutputCall
before the profiler duration elapses. This also changes make
PerfOutputCall to move the profiler output in the callback so that the
user class doesn't need to hold hold the PerfOuptutCall instance alive
when using the profiler output.

Bug: 904785
Test: locally build.
Change-Id: I7ea63962c234a9c6b55d8948e3b98fa496b3784c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1637024
Commit-Queue: Chinglin Yu <chinglinyu@chromium.org>
Reviewed-by: Gabriel Marin <gmx@chromium.org>
Reviewed-by: Ryo Hashimoto <hashimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#671940}