51706cd06f
`FlutterPlatformViewLayerPool` is a pool of iOS layers used for rendering platform views on iOS. When layers are no longer needed, we currently mark them available for re-use but we never actually flush them and thus recover the memory associated with these layers once we know that the layers are no longer needed. We now flush the layer pool on `SubmitFrame` if a previously-used layer is no longer used in the current frame. In theory, this could cause a performance regression in the case where an additional layer is needed every second or third frame, but we should keep it simple on the first pass and only complicate things later if warranted. Fixes: https://github.com/flutter/flutter/issues/152053 [C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style
Flutter Engine
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