Chris Yang 7f5540faac
PlatformViewLink handles focus (#38643)
In the build of PlatformViewLink, Added a FocusNode wrapping around the surface widget.
The focus node will ask platform view to clear its focus when necessary through [PlatformViewController.clearFocus].
The platform view can notify the framework it wants to gain focus by calling [PlatformViewCreationParams.onFocusChanged]
2019-08-26 12:04:17 -07:00
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