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23187a652e
After landing https://github.com/flutter/engine/pull/54676 we had the DLBuilder using legacy size fields in the DLOp records to manage traversing the records, but we constructed a more direct "offset vector" for the DisplayList to enable random access to the ops. The offset vector was created on the fly during the `Build()` method and then the size fields in the DLOp records were largely unused and redundant. This PR gets rid of the remaining uses of the DLOp size fields and has the Builder produce the offsets vector directly during recording.