[fidl][go] Fix an empty response from a protocol method

Currently, both these two protocol method definitions generate
Dispatch() that returns nil as a response:

1. Foo()        // no response.
2. Foo() -> ()  // the response is empty.

And the current Go bindings always thinks the nil response means
(1). Calling the method defined as (2) would get stuck because
there is no response coming back.

To fix (2), we replace Dispatch() with DispatchImpl() that returns
an extra boolean flag that tells if a response is required or
not. If the response is nil but the flag is true, Go bindings
can tell it is (2).

Bug: 8098
Change-Id: I5d814d164dc43c0e0c4b8a025b8925d455a38480
8 files changed
tree: 170c757c43a8bde6b5aab8f94942be5e4a0ca66e
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. makefuchsia/
  6. makeroot/
  7. meta/
  8. misc/
  9. src/
  10. test/
  11. .gitattributes
  12. .gitignore
  13. AUTHORS
  14. BUILD.gn
  15. CONTRIBUTING.md
  16. CONTRIBUTORS
  17. favicon.ico
  18. LICENSE
  19. PATENTS
  20. README.md
  21. regen-fidl
  22. robots.txt
  23. VERSION
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