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And add a bit to our style doc about naming of extensions. Change-Id: I22dd05dfe08b46ae38cc200456eb008e02eb002f Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/347782 Reviewed-by: Brian Wilkerson <brianwilkerson@google.com> Commit-Queue: Brian Wilkerson <brianwilkerson@google.com> Auto-Submit: Samuel Rawlins <srawlins@google.com>