towards#167478

Pre-launch Checklist

• I read theContributor Guide and followed the process outlined there for submitting PRs.
• I read theTree Hygiene wiki page, which explains my responsibilities.
• I read and followed theFlutter Style Guide, includingFeatures we expect every widget to implement.
• I signed theCLA.
• I listed at least one issue that this PR fixes in the description above.
• I updated/added relevant documentation (doc comments with///).
• I added new tests to check the change I am making, or this PR istest-exempt.
• I followed thebreaking change policy and addedData Driven Fixes where supported.
• All existing and new tests are passing.

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