Cherry-pick fix for ForwardingGestureRecognizer 1c13abaab120d8d2d4c07e5b5fc75100f56a89e2

[cyanglaz]

This is a cherry-pick of 1c13aba

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We found a Contributor License Agreement for you (the sender of this pull request), but were unable to find agreements for all the commit author(s) or Co-authors. If you authored these, maybe you used a different email address in the git commits than was used to sign the CLA (login here to double check)? If these were authored by someone else, then they will need to sign a CLA as well, and confirm that they're okay with these being contributed to Google.
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[flutter-dashboard]

This pull request was opened against a branch other than master. Since Flutter pull requests should not normally be opened against branches other than master, I have changed the base to master. If this was intended, you may modify the base back to flutter-1.20-candidate.7. See the Release Process for information about how other branches get updated.

Reviewers: Use caution before merging pull requests to branches other than master, unless this is an intentional hotfix/cherrypick.

[cyanglaz]

Close in favor of #20797

[christopherfujino]

Note, my PR is for beta channel. Once I get that release done, I'm gonna work on stable, so I'll probably use this PR.

[christopherfujino]

Note, my PR is for beta channel. Once I get that release done, I'm gonna work on stable, so I'll probably use this PR.

Never mind, ended up just cherry-picking the commit into my own PR. Thanks for opening this though!