stuartmorgan 158f80097d Add an explicit API for font change notification (flutter/engine#21164)
Originally font change notification was handled by forwarding
WM_FONTCHANGE to the Flutter HWND, to avoid adding new API surface, but
that's not a good solution in a multi-window scenario, and it would
require a completely different solution for UWP. It also requires
non-obvious plumbing in the runner.

This replaces that with an explicit API, so that there's a clean and
obvious way for the runner to trigger this event.
2020-09-16 09:47:21 -07:00
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