When `retainPriorEvents` is passed as true, the current behavior still limits timeline events to the timestamp after `traceEvents` is called. This can cause startup events to be missing.

This fixes it by passing null to `stopTracingAndDownloadTimeline` for the start and end time.

Related: #58430

* Add comments to flutter_driver for timeline class

Mostly about explanation for the json items from
timeline.dart and timeline_summary.dart.

As of flutter.dev/go/engine-cpu-profiling, we collect the CPU and
Memory usage. With work being done to collect GPU usage on iOS as well.

This adds them to the timeline summary.

Fixes: https://github.com/flutter/flutter/issues/58803

Work-around large timeline data killing devicelab machines by requesting data in 1 second intervals and combining at the end. Non-breaking change to the driver API.

This reverts commit 26516817.
Co-authored-by: Kaushik Iska <kaushikiska@google.com>

This reverts commit ce92333b.

Parser would earlier alternate after finding the first
begin event, not it looks for pairs.

Fixes: https://github.com/flutter/flutter/issues/54095

* Support Android Chrome for Flutter Web Driver.

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 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.