Roll alpha (flutter#11874)

Wrap the label widget of the Chip in a Flexible. (flutter#11523) (flu…

…tter#11554)

* Wrap the label widget of the Chip in a Flexible. (flutter#11523)

* This allows the Chip to constrain the size of its content after taking into account the space occupied by the avatar and delete icon (if they are present)

* Adding unit tests to evaluate correct size constraints of the Chip widget's label. (flutter#11523)

* Minor change in formatting.

* Adjust function formatting.

prepare alpha release (flutter#11464)

Update versions for an alpha release (flutter#10896)

modernize iOS device lookup in driver (flutter#10780)

Prepare Alpha 0.0.9 (flutter#10712)

Bump version in preparation for new tag (flutter#10689)

flutter#10688

Release SDK version 0.0.7 (flutter#10456)

Rev alpha branch version to 0.0.6, flutter 0.0.26 (flutter#10010)

VERSION: 0.0.6
flutter: 0.0.26
flutter_driver: 0.0.4
flutter_test: 0.0.4

Merge pull request flutter#779 from abarth/basic_docs

Add some dartdoc to basic widgets