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- Encapsulate deserialize buffer and size into a DeserializeBuffer class. This limits the possible operations so we can be sure buffer/size are not manually mutated such that we consume more bytes than available. - Ensure that memberLength (on deserialization) doesn't narrow (or widen). Previously, values were always implicitly cast to size_t. - Slight optimization that removes "= nullptr" initialization for pointers written by DeserializeBuffer::Read. These are always written to on success, so we don't need to initialize to nullptr. Bug: dawn:680 Change-Id: I3779a343e85ff90810707148a952c6ba27cf9d22 Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/41521 Commit-Queue: Austin Eng <enga@chromium.org> Reviewed-by: Stephen White <senorblanco@chromium.org>