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efe7683311
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.