* Support Android Chrome for Flutter Web Driver.

This is required to roll forward package:vm_service to 3.0.0 and is
blocking a DevTools release.

This reverts commit d3387bc9.

[a11y] Make sure RenderFractionalTranslation updates its semantics after the translation field is set (#48985)

This reverts commit 50d42122.

This reverts commit e43fd1c5.

* fix duration event of timeline summary

* Revert "fix duration event of timeline summary"

This reverts commit 699aa45ed3d115f8bbea95cf6d37116b442db399.

* fix duration event of timeline summary

This reverts commit cc1c9649.

This reverts commit c235998a.

This reverts commit 1ef0eadb.

* Support Flutter Driver test for Flutter Web application.

* Support Flutter Driver test for Flutter Web application.

* Fix documentation issues.

* Support Flutter Driver test for Flutter Web application.

* Fix documentation.

* Remove unused file from dartdoc check.

* Sync to date.

* Revert change to dartdoc.

* Address comments.

* Apply suggestions from code review
Co-Authored-By: Jonah Williams <jonahwilliams@google.com>

* Update copyrights.

* Update allowed list for browsers.

* Verify command line arguments for Drive command is correctly parsed.

* Make waitUntilFirstFrameRasterized throw unimplementedError for Flutter Web Driver.

* Add comment for why sync WebDriver is used.

* Update documentations.

* Add more unit tests and update documentation.

* Configure test.dart so that web_extension_test will be executed with --platform=chrome.

* Revert unnecessary changes.

* Add new file path for Windows to blacklist.

* Reconstruct the structure of flutter_driver/test/src folder to remove filtering logic in dev/bots/test.dart/

* Fix path to web_extension_test.dart.

* Add instructions for how to use WebFlutterDriver.

* Update getLayerTree to use sendCommand instead of _sendCommand.

* Update pubspec files.

* implicit-casts:false in flutter_driver

* address review comments