tree e0e14a855a48408ee9f9cd17d2561728c0822d6e
parent 5b578d04a2ce826a05a173ff794ef3396b6f858e
author Felix Zhu <fcz@google.com> 1578504439 -0500
committer Felix Zhu <fcz@google.com> 1580223284 -0500

[fidl][dart] Use struct typeshapes for requests/responses

Bug: 7704

This updates the dart bindings to use the payload struct type
info, so that parameter offsets and request/response sizes no
longer include the message header. In the bindings, this leads
to the following changes:
  - when encoding, we can just alloc the request/response size
    instead of subtracting the header size
  - when decoding, we claimMemory separately for the header than
    for the payload
  - in both encoding/decoding, the calls to MemberType.encode/decode
    use a base offset of kMessageHeaderSize instead of 0

Test: fx run-test fidl_bindings_test
Change-Id: I8297e1583541ccd842eb743626df0fd65a93a9df