* Add to Artifacts, and add optional arguments to entry points for flut… (#15185)

Add to Artifacts, and add optional arguments to entry points for flutter run and test to allow for wiring up the same with preview-dart-2 internally

* Changing packages uri here is not necessary

* Add a test that measures/verifies start from warm state(app was previously compiled).

* Remove json file from the first run.

This reverts commit e0f6e626.

Add to Artifacts, and add optional arguments to entry points for flutter run and test to allow for wiring up the same with preview-dart-2 internally

Pass extra front-end and gen_snapshot options to GenerateDependencies gradle task, as it also runs 'flutter build aot' (#14980)

https://github.com/dart-lang/pub/issues/1812

* [semantics]: minor docs & style clean-up

* remove a

* add a debug check that the returned Type of State.initState and State.didUpdateWidget are not Futures

* add test to verify that async lifecycles throw FlutterErrors

* address some feedback, match implementation of setState check

* address feedback from hixie

* fix odd spacing in test

* Run dev/bots/test's flutter drive test in preview-dart-2

* Fix extension callback type

* More type fixes

Fixes https://github.com/flutter/flutter/issues/15136

Someone ended up with STAMP_PATH containing a blank line.

Also, replace [ with [[.

* [tools] consolidate "preview Dart 2" option in BuildInfo

* format BuildInfo constructor

Document missing value types supported by `within`. Add missing tests. Simplify _sizeDistance implementation.

when a hot reload is done after modifying a component in the flutter
package.

* Use depfile in --preview-dart-2 mode.

* Generate and use frontend_server.d to guard against reusing outdated dill files when frontend_server changes.

Changes since last roll:
  - Leave only widget creation tracker kernel pass in flutter frontend server. (#4727).

* Roll engine to c88ba37c794f57982374bb53a694301198cad593.

Changes since last roll:
  - move generated entry points JSON out of flutter_patched_sdk
  - List missing core lib bigint_patch.dart source for new Bigint implementation (#4735)
  - Skip over .emf-files. (#4739)
  - Roll dart to ee15c8eb689791f6777eb3f6b0a1e9c58ff0671b.

* defaultValue -> orElse

Orientation, and by extension time for rotation between orientations,
was aspirational and never used.

While this is technically a breaking change, this code never actually
did anything. If you were setting either orientation or timeForRotation,
simply delete those parameters and the code will continue to behave
identically to how it had been.

Fixes a small rendering problem when dragging the slider, as well as a couple of small bugs (de-duping of value changes, and actually using a parameter passed to _unlerp).

Includes:
* Add nil check for country code and language code (flutter/engine#4732)

This implements an update to the look of the Slider widget.

Specifically, it does the following:

* Adds the ability to customize the colors of all components of the slider
* Adds the ability to customize the shape of the slider thumb and value indicator
* Adds the ability to show the value indicator on continuous sliders
* Updates the default value indicator to be a "paddle" shape with new animations.
* Changes the tick marks to be visible all the time on discrete sliders
* Fixes a memory leak of an animation controller.
* Removes "thumbOpenAtMin" flag, which is no longer needed, and can be emulated by the
custom thumb shape support. It was not widely used.
* Adds tests for all of the new features.

Fixes https://github.com/flutter/flutter/issues/14950

In the case of "dev", `git checkout dev` could be miconstrued
as checking out the dev _directory_ rather than the branch...

https://github.com/flutter/flutter/issues/14865

* Show 32/64bit in VS Code headings on Windows

Fixes #14949.

* Run flutter tests in preview-dart-2 mode on travis flutter builds.

* Run dart2 tests on osx. Run dart tests in dart2.

* Fix name camelCase

* Default options to empty array, rather than null

* Troubleshoot failures

* More logging

* Troubleshoot: run single test

* Troubleshoot: run 15 tests

* Troubleshoot: run 15 tests with fix

* Try limit concurrency to 1

* Limit concurrency for preview-dart-2 tests to 4

* Move dart2 tests to allow_failures section

* Reinstate tests_dart_2 shard

* Raise concurrency to 8

* Reuse compiler across multiple test runs

* Allow to switch entry points when recompiling.

Actually use single compiler to incrementally recompile all tests executed by 'flutter test'.

* Remove leftover commented code

* Fix comment

* Lints

Changes since the last roll:
  - Specify sdkSummary when compiling via frontend server (#4733).
  - Fix traversal order for a11y scrolling (#4726)

accidentally missed due to named parameters being omitted.

Adds more actionable error messages for users of the most common Linux
distributions. We could improve this by checking the current
distribution and emitting only the appropriate error message. We could
further improve that by only emitting the install instructions if we
determine the appropriate package is not installed.

See: https://github.com/flutter/flutter/issues/6207