Set up chrome-types for upcoming schema changes.

[chromatim]

There's an upcoming schema change on the Chromium side which will flip all asynchronous returns to be defined using the "returns_async" field, instead of only for Promise-supporting functions. Previously this repo used the presence of the "returns_async" field as an indicator of promise support, but with the upcoming schema changes we instead need to look for the "does_not_support_promises" property on the "returns_async" field.

This pull request adds in support for looking for this new property and only returning the callback signature if it is there, while also remaining backwards compatible with the older form so the change can happen cleanly.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (650e007) 43.96% compared to head (a1ed8de) 44.20%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #67      +/-   ##
==========================================
+ Coverage   43.96%   44.20%   +0.23%     
==========================================
  Files          21       21              
  Lines        4035     4052      +17     
  Branches      265      270       +5     
==========================================
+ Hits         1774     1791      +17     
  Misses       2261     2261              

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[oliverdunk]

Left a couple of thoughts, but otherwise this looks great. Thanks so much for the time on this and for adding a test.

[chromatim]

Oh right, I left these pending and didn't realize github requires one to "Submit review" to post them. I believe I've got all the changes in that were requested now.

[oliverdunk]

Thanks for the work making these changes and your patience! LGTM.