Greg Spencer f9c6f30576
Allow users to create samples using flutter create. (#23584)
This adds flutter create --sample which allows users to execute a command which will create a working sample app from samples embedded in the API docs.

The command looks something like this:

flutter create --sample=chip.DeletableChipAttributes.onDeleted mysample
2018-10-30 16:01:14 -07:00
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