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[Impeller] Add a benchmark that captures advanced blends / backdrop filters #131784

@gaaclarke

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@gaaclarke

Currently, we are using the gallery app to benchmark performance. However, we've observed that in apps like Wonderous, the performance profile differs. This is because they frequently use backdrop filters and advanced blends. Advanced blends represent a known weak spot in the Vulkan backend, which we are actively addressing. It's crucial that we capture the results of those improvement efforts.

Integrating Wonderous into CI might not be the best strategy. Instead, we should create a benchmark inspired by the types of scenes they render.

This will also be significant for #131782. The Vulkan backend required a special investment, and it's essential to ensure that it consistently outperforms the OpenGL ES backend.

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    P1High-priority issues at the top of the work liste: impellerImpeller rendering backend issues and features requeststeam-engineOwned by Engine teamtriaged-engineTriaged by Engine team

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