* Added support for authentication codes for the VM service.

Previously, a valid web socket connection would use the following URI:

`ws://127.0.0.1/ws`

Now, by default, the VM service requires a connection to be made with a
URI similar to the following:

`ws://127.0.0.1:8181/Ug_U0QVsqFs=/ws`

where `Ug_U0QVsqFs` is an authentication code generated and shared by
the
service.

This behavior can be disabled with the `--disable-service-auth-codes`
flag.

* Support release/debug flavors of flutter_patched_sdk

* Use [anyNamed] instead of [any] for mocking named arguments

* Fix use of local engine in release mode

Reland: Ensure that flutter run/drive/test/update_packages only downloads required artifacts  (#30254)

Revert "Ensure that flutter run/drive/test/update_packages only downloads required artifacts (#30075)" (#30232)

* Use source list from the compiler to track invalidated files.

* Revert accidental change

* Fix first-time-seen-the-file logic

* Fix/simplify invalidate logic now that we can rely on compiler to let us know what is the cut-off point for invalidation.

* Update devfs mock to accommodate for new fields

* Fix deleted files case

* Analyzer found missing final

This is the accompanying change for https://github.com/flutter/engine/pull/8148 and it needs the engine PR to land first.

For https://github.com/flutter/flutter/issues/813

* 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

This reverts commit 76061c4f.

This reverts commit 98971f3c.

* Add support for experimental flags during hot reload.

* Revert "Make UriMapper and StdoutHandler public and add test cases (#26932)"

This reverts commit 6cf554b0.

* Revert "Update packages (#27046)"

This reverts commit 496c5738.

* Revert "roll engine for TODAY bug (#27049)"

This reverts commit 5ae6346f.

* Revert "Warn when building on master channel (#25007)"

This reverts commit dd65a546.

* Revert "Add experimentalBuildEnabled flag and initial shim for build_runner (#26989)"

This reverts commit 1237ee8f.

* Revert "Experimental flags for hot reloads, fixed (#27043)"

This reverts commit 2c05d08f.

* Revert "Revert "Experimental flags for hot reloads (#26988)" (#27037)"

This reverts commit cf744198.

* Fix analysis failures

This reverts commit 763bf114.

* First pass at incremental exp flags

* adkfgjh

These are essentially self-inflicted race conditions. Instead of timeouts we're going to try a more verbose logging mechanism that points out when things are taking a long time.

* exp flags in flutter

* Fix test failures

* Renamed --save-compilation-trace to flutter run --train.
* Renamed --precompile=<file> to --compilation-trace-file=<file>.
* In dynamic mode, made JIT snapshot the default, instead of kernel file.

* Add ipv6 and observatory port support to the attach command.

* Remove whitespace

* Explain why a name change is useful here

* Refactor common flags out into the parent

* Add an additional test case for when observatory port is provided but debug port is not

* Remove whitespace

* Fix flag validation

* update lint list

* enable sort_pub_dependencies

* enable avoid_returning_null_for_void

* enable flutter_style_todos

* Fix --pid-file not working for --machine + add to attach

Fixes #23201.

* Add tests for --pid-file in run+attach