This reverts commit 5b357500.

* fix updrade script; upgrade to the latest package versions

* exclude special dependencies from transitive closure

* fix stack trace handling in flutter_test due to stack_trace change

* change type on _emptyStackTrace

This is follow-up to be1467e0.

Previously chosen pattern was generated in the output not quite at the end of the hot reload process.

* Restructure hot mode test so it runs interactively.

This allows to add a benchmark for hot reload after actual source code change.

* Add curly braces, refactory copyRecursive

* Add hotReloadInitialDevFSSyncMilliseconds to track how long user have to wait before being able to do first reload.

This stat is significantly different between existing and preview-dart-2 setting (for the latter, this stat is ~3x slower: 13s vs ~4s).

* Remove ws

* Cleanup timer-related code

* Force upgrade update packages with improved update process.

* Update packages

* Revert "Update packages"

This reverts commit a37de26d3f4f7f5a15746ff791002625faa3d3c0.

* Clone hot reload benchmark for --preview-dart-2 option.

* Get rid of linux and win preview_dart_2 (only android would be sufficient for now). Refactor code into lib/tasks

* Revert 2016 to 2017

* Mark new test as flaky

* Pin all dependencies ONCE AND FOR ALL

This replaces the secret `flutter update-packages --upgrade` with a destructive `flutter update-packages --force-upgrade` that actually goes and pins every dependency and transitive dependency in every flutter package to the same version.

* Add comments.

* only tap on widgets reachable by hit testing

* use FractionalOffset

* added tests

* check finder finds correct widget

* undo unintentional changes

* address comments

* style fix

* add Directionality in test

* fix analysis warning

This adds --preview-dart-2 flag that enables use of Dart 2.0 Frontend in Flutter tools.

* Revert "Revert "fire service protocol events for frames (#11565)" (#11727)"

This reverts commit f25e2f52.

* move the postEvent() call into a separate method

* upgrade to linter-0.1.35

* re-enable lint prefer_const_constructors

* address review comments

This reverts commit 8d07d3f6.

This reverts commit 5f9acc41.

- Wait for full Hot Reload
- Wait for full Restart
- Fallback if checkHealth throws METHOD_NOT_FOUND.
  We try to wait for the service extensions to be registered and retry.

* Bump Dart SDK to 1.25.0-dev.9.0

* add link to sdk bug

The most recent Flutter IntelliJ plugin replaces FLUTTER_MODULE with
WEB_MODULE and eliminates the exclusion of packages/ directories.
Use of the packages/ directory was turned off by default months ago, and
is replaced by the .packages file.

Also, add tests to verify that our coverage is actually being tested!

* refactor commands_test to choose a free port for the service protocol

* discover the service protocol port

* add a todo

This reverts commit 4b4cabb7.

* fire service protocol extension events for frames

* start time in micros

* introduce a profile() function; only send frame events when in profile (or debug) modes

* moved the profile() function to foundation/profile.dart

* refactor to make the change more testable; test the change

* fire service protocol events by listening to onFrameInfo

* remove the frame event stream; add a devicelab test

* remove a todo

* final