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Valentin Shergin
d76e03f85a
Summary: `RunLoopObserver` is one of the core interfaces that bridge intrinsically platform-specific functionality to cross-platform React Native core. `RunLoopObserver` allows subscribing for notifications about changes in a run loop life cycle. Primarily it supposed to be used for observing UI (aka main) and JavaScript execution thread/run-loop. Having a `RunLoopObserver` implemented in a platform-specific manner allows building these components in a cross-platform manner: * Sync and async UI event delivery pipeline; * Timing for some animation engine; * Timers (probably additional features are required). Changelog: [Internal] Fabric-specific internal change. Reviewed By: sammy-SC Differential Revision: D21341997 fbshipit-source-id: 7ef61fb51f550dd0f2e89c64af657e0f0de029aa