Loïc Sharma a01206ad39 Add completion callback to Shell::AddView (flutter/engine#51659)
In the future, `FlutterEngineAddView` will be added to the embedder API to allow embedders to add views. `FlutterEngineAddView` will accept a callback that notifies the embedder once the view has been added.

This embedder API will be powered by `Shell::AddView`. This change adds a completion callback to `Shell::AddView` to prepare for the embedder API.

Design doc: https://flutter.dev/go/multi-view-embedder-apis

Part of https://github.com/flutter/flutter/issues/144806
Part of https://github.com/flutter/flutter/issues/142845

[C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style
2024-03-29 00:39:10 +00:00
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