e0529ddd815fd2ac35564f6531ed72bb4102bec6
Enhances the overlay optimization by pushing new pictures to the earliest RenderCanvas they can go into. This improvement is made especially clear in the new test case I added to `embedded_views_test.dart`, with the previous algorithm we would have used an overlay for each platform view even though all of the pictures could go into the base canvas with no issue. [C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style
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