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This adds support for a new [UnlimitedSize] attribute on mojom
interface methods, allowing them to bypass size-checking constraints in
cases where the possibility of an occasional very large message is a
known issue and is either awaiting a fix or is deemed acceptable as-is.

Bug: None
Change-Id: I6a2f884c71bf912e8804ed40afd22132b4d8e969
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2368429
Commit-Queue: Ken Rockot <rockot@google.com>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800718}