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An unnecessary PrerollContext copy is also removed. The added unit test will catch the error if we forget to subtract the elevation after the copy removal. This change has been tested with the framework (`flutter test --local-engine=host_debug_unopt`).
Flow
Flow is a simple compositor based on Skia that the Flutter engine uses to cache recoded paint commands and pixels generated from those recordings. Flow runs on the GPU thread and uploads information to the GPU.