Allow processing GPU start and end events to get processed by flutter driver. To figure out whether or not this works we'll ship in on CI :)

This measures the wall clock time between a new frame being scheduled in dart code to the Vsync callback in the engine

It's an important source of lag which isn't shown in the top-level UI / Build time graphs, and can correlate with "invisible" missed/non-scheduled frames

I had to change a few unrelated timings in the test, it was only passing based on luck of sort order, and broke when I added more entries to the timeline.

Part of #129150

This calculation is important if you want to calculate the probability that one thing is better than another.

Most of these imports were never appropriate. The `test_api` package was never intended for use in `_test.dart` files.
Where possible move imports to `matcher`, otherwise move them to `test` or `flutter_test`.

Leave uses of `test_api` from `flutter_test` library code.

Fix how tests count open SemanticsHandles

* Make Flex,Row,Column const for real

* dart fix --apply

* fix snippets

* fix integration test

* add comment

* Enable  lint

* note about discarded_futures

* note about use_decorated_box

* update note on require_trailing_commas

* Test the case when main Isolate is in `None` state for long time

* Wait for isolate to become runnable

* Handle `PausePostRequest` as a normal "paused" event

* Use `-= 1` instead of `--`

* Support receive input action

* Fix error syntax

* Fix compile

* Add documents

* Add unit-test

* Update import

* Fixed unit-test and lint

* Add authors for me

* Fixed lint

* Fixed lint

* Add example

* Fixed lint

* Fix gen docs

* Revert code

* Remove flutter_dev

* Update packages/flutter_driver/lib/src/driver/driver.dart
Co-authored-by: Tong Mu <dkwingsmt@users.noreply.github.com>

* Update packages/flutter_driver/lib/src/common/action.dart
Co-authored-by: Tong Mu <dkwingsmt@users.noreply.github.com>

* Update packages/flutter_driver/lib/src/common/action.dart
Co-authored-by: Tong Mu <dkwingsmt@users.noreply.github.com>

* Rename ReceiveAction to SendTextInputAction

* Rename DriverTextInputAction to TextInputAction and fix unit-test

* Reorder import

* Remove space

* Reorder import

* Update text_input.dart

* Update flutter_driver_test.dart

* Update comment to normal comment after dart doc

* Update example

* Update AUTHORS
Co-authored-by: Tong Mu <dkwingsmt@users.noreply.github.com>

* Fix analyze

* Add type dart for example

* Add unit-test to check the same entries
Co-authored-by: Tong Mu <dkwingsmt@users.noreply.github.com>

This reverts commit a7c85996.

Validate WebDriver responses

This reverts commit 5fd259be.

This reverts commit cb378edc.

* Randomize tests, exclude tests that fail with randomization.

* Disable some more tool tests

This change fixes the driver tests "VMServiceFlutterDriver with logCommunicationToFile logCommunicationToFile logCommunicationToFile = false" and "WebFlutterDriver with logCommunicationToFile logCommunicationToFile = false" so that they will no longer fail when run locally.

The issue was one of not cleaning up the log files after the test ran, so a later run with the same name would see it. Presumably on the servers the tests are run in a different environment where the names or locations of the output files end up being different.

This reverts commit d056500b.