* With dart being default, move preview_dart_2 tests to dart1.
* Swap out defaults for preview-dart-2 option in tests. Make dart1 explicit
* Move suffix around
* Rename files
* Roll engine to b6df7a637498ca9beda1fa9cd7210e3202ea599f.
Changes since last roll:
```
b6df7a637 Roll dart to 290c576264faa096a0b3206c71b2435309d9f904. (#4771)
a6764dbd5 Add sources for Fuchsia target. (#4763)
2d5900615 [fuchsia] Remove unused header file. (#4769)
9717063b7 Revert "Roll dart to c080951d45e79cd25df98036c4be835b284a269c. (#4767)" (#4768)
9a9814312 Roll dart to c080951d45e79cd25df98036c4be835b284a269c. (#4767)
e74e8b35c [async] Update includes of async headers to new path (#4760)
e2c4b2760 Use Dart 2 camel case constants in the engine Dart libraries (#4766)
9c1e48434 Updates for Fuchsia roll. (#4765)
14c940e27 Switch from fxl::Mutex to std::mutex (#4764)
debf82c0b Roll Garnet (#4759)
5bffdefbb Use weak pointers to the accesibility bridge from objects vended to the UIKit accessibility framework. (#4761)
```
* Update dependencies with forced upgrade.
Now that https://github.com/flutter/flutter/issues/15261 is fixed, do the update with upgrade.
* Update test package use following upgrade
* Replace addOption(allowMultiple) with addMultiOption
* Reject requests for hot reload if a hot reload is already in progress.
Fixes#14184
* Implement TODO, verifying further hot reloads complete sucessfully.
* Fix year on new file.
* Add missing type annotations to fix lints
* Add run_machine_concurrent_hot_reload to manifest for CI
* Reformat document
... but undo things that cause lints (like single-line ifs)
* Extract std stream transformations
* Make inProgressHotReload private
* Disallow all types of reload while hot reload in progress
* Simplify code handling in-progress hot reloads
This fills out the following matrix:
App: `flutter create` default app, Complex Layout, and Gallery.
Platforms: Linux/Android, Mac/iOS, Windows/Android
Build modes: full release, aot blobs, debug
Dart: normal, 2.0 preview
It also renames all the tests that used "build" to mean compilation
build to use "compile" instead, so that it's much clearer on the
dashboard.
Also, mark some flaky tests that are no longer flaky as not flaky.
Also, remove uses of call() since that's probably going to go away at
some point.
* 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
* Revert "Revert "fire service protocol events for frames (#11565)" (#11727)"
This reverts commit f25e2f5213b064edc1fa71bb2326a3e1e15fcbd6.
* move the postEvent() call into a separate method
- 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.
