stuartmorgan be5bc34af1 Add a task runner for the Win32 embedding (flutter/engine#13043)
Adds a task runner, and exposes API to allow application-level runloops to know when they need to next call the API to process engine events. Internally, sends null events to wake up the app runloop when new events are scheduled to ensure the wait time is updated accordingly.

Fixes #36420
2019-10-16 21:30:06 -07:00
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