This issue tracks preparing an engine variant that doesn't compile in parts of Skia GPU that would be necessary to service a non-Impeller build.

The rubric would be to disable skia_enable_metal, then skia_enable_gpu, and so on. Fixing the existing build rules to make sure we get a linked engine. The binary size can then be analyzed at each step.

From the conversation in go/flutter-engine-without-skia-gpu.