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Introduces a mechanism to allow backdrop filters to 1) share backdrop inputs and 2) fuse filter applications for faster blurs. This is a proposed solution to https://github.com/flutter/flutter/issues/131568 Implemented: * Developer can specify a "backdrop id" which indicates that a backdrop layer should share the input texture and potentially cached filter for a layer. * Removes second save layer for each backdrop filter * Removes save layer trace event for backdrop filter * Can fuse backdrop filters if there is more than one identical filter TBD: * Adjust heruristic to avoid applying bdf filter to entire screen Suggestions: applying a bdf should be a distinct operation from a save layer in the DL builder/dispatcher. The saveLayer implmenentation in the impeller dispatcher is super convoluted because it needs to handle both. ### Video Video starts with normal bdf then I hot reload to specify that the bdfs share inputs/filters. This is running on a pixel 8 pro Change to the macrobenchmark app is just: ```dart Widget build(BuildContext context) { Widget addBlur(Widget child, bool shouldBlur) { if (shouldBlur) { return ClipRect( child: BackdropFilter( filter: ImageFilter.blur(sigmaX: 5, sigmaY: 5), backdropId: 1, // Added ID child: child, ), ); } else { return child; } } ``` https://github.com/user-attachments/assets/22707f97-5825-43f1-91b4-1a02a43437f5 Requires framework changes in https://github.com/jonahwilliams/flutter/pull/new/backdrop_id