This reverts commit d4112424.

Reland: #67155

Fixes analysis error caused by landing of material migration, and g3 error caused by moving of fuchsia lib.

This reverts commit e826442e.

Ensures all of the libraries that the application side code import are migrated to null safety. full null safety migration is blocked by json rpc 2 and a breaking change to vm service client.

Category isn't preserved by timeline events as `Dart_TimelineEvent`
specifies the category as `embedder`.

Fixes: https://github.com/flutter/flutter/issues/60008

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

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

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.

* Update project.pbxproj files to say Flutter rather than Chromium

Also, the templates now have an empty organization so that we don't cause people to give their apps a Flutter copyright.

* Update the copyright notice checker to require a standard notice on all files

* Update copyrights on Dart files. (This was a mechanical commit.)

* Fix weird license headers on Dart files that deviate from our conventions; relicense Shrine.

Some were already marked "The Flutter Authors", not clear why. Their
dates have been normalized. Some were missing the blank line after the
license. Some were randomly different in trivial ways for no apparent
reason (e.g. missing the trailing period).

* Clean up the copyrights in non-Dart files. (Manual edits.)

Also, make sure templates don't have copyrights.

* Fix some more ORGANIZATIONNAMEs

* some space formattings

* always use blocks in if-else if a block is used

* format spaces in for and while

* allow multiline if conditions

* fix missing space

* add trailing commas on list/map/parameters

* add trailing commas on Invocation with nb of arg>1

* add commas for widget containing widgets

* add trailing commas if instantiation contains trailing comma

* revert bad change

Because we now have 2 separate GPU and UI threads.

See https://github.com/flutter/flutter/pull/19121#issuecomment-419520765

* enable lint unnecessary_new

* fix tests

* fix tests

* fix tests

All temporary directory start with `flutter_` and have their random component separated from the name by a period, as in `flutter_test_bundle.YFYQMY`.

I've tried to find some of the places where we didn't cleanly delete temporary directories, too. This greatly reduces, though it does not entirely eliminate, the directories we leave behind when running tests, especially `flutter_tools` tests.

While I was at it I standardized on `tempDir` as the variable name for temporary directories, since it was the most common, removing occurrences of `temp` and `tmp`, among others.

Also I factored out some common code that used to catch exceptions that happen on Windows, and made more places use that pattern.

* Upgrade everything except matcher.
* Roll matcher (and test)
* Adjust tests that depend on flutter:test directly to depend on a shim
* Require use of package:test shim and remove other references to package:test

See https://github.com/flutter/flutter/pull/18881#discussion_r199285256

Our first step towards https://github.com/flutter/flutter/issues/18727