Test infrastructure to expose whether a browser intends to expose transferSize across origins with TAO #371
Description
With #369 doing a corresponding PR to web platform tests makes them no longer catch regressions in intended transferSize exposure. For example, assert(timing.transferSize == 42) needs to be changed to assert(timing.transferSize == 0 || timing.transferSize == 42). It would be better if we could instead change it to if (internals.allowsCrossOriginTransferSize) { assert(timing.transferSize == 42) } else { assert(timing.transferSize == 0) }. Since the motivation of this is for unit tests, it would probably be distasteful to expose a boolean to the web platform, the implementation of which would just be a hard-coded value. Same applies to encodedBodySize, decodedBodySize, and server timing.
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