stuartmorgan bb04632eeb [windows] Allow delegation of top-level WindowProc (flutter/engine#20613)
Adds APIs for runners to delegate WindowProc handlers into the Flutter
engine, and for plugins to register as possible delegates.

This allows for plugins to alter top-level window behavior in ways that
can only be done from the WindowProc, such as resize control. This
functionality remains entirely on the native side, so is synchronous.

Part of https://github.com/flutter/flutter/issues/53168
2020-08-19 06:49:39 -07:00
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