David Aurelio f1a3137b41 Add MarkerSection
Summary:
@public

Adds a class for triggering markers.

This calls `startMarker()` on construction, and `endMarker()` on destruction, thus being usable like a "scope guard": the object is instantiated, and automatically destroyed when going out of scope.

Reviewed By: SidharthGuglani

Differential Revision: D13817589

fbshipit-source-id: fd88884af970c1c0933d9ca6843f3f8f5d28b9e6
2019-01-29 11:41:36 -08:00
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