* enable lint unnecessary_new

* fix tests

* fix tests

* fix tests

* Don't set the `vmServices` member variable until it's fully initialized.
* Add a timeout to the future that sends the 'started' event to the IDE

https://github.com/flutter/flutter/issues/16604

flutter/engine@9a173a8 Roll buldroot to a11c4fd9fcc7ad84f465d74461421f3ec790fb99

flutter/engine@51b26f6 Revert "Roll buildroot to eba79bb6db1b50a98ab8ce39def287f7d332a5b8 (#6215)"
flutter/engine@7be4462 Roll src/third_party/skia 2bf7a7bcc67f..bd6595544171 (4 commits)
flutter/engine@54fe12b Roll src/third_party/skia 82bf31003c66..2bf7a7bcc67f (1 commits)
flutter/engine@35ddf87 Roll buildroot to eba79bb6db1b50a98ab8ce39def287f7d332a5b8
flutter/engine@6ed00a8 Roll src/third_party/skia 5518e65d90d7..82bf31003c66 (1 commits)
flutter/engine@8d9e20c Roll src/third_party/skia 3c4d533d8ebd..5518e65d90d7 (1 commits)
flutter/engine@8f39cac Roll src/third_party/skia 7891994e89a3..3c4d533d8ebd (1 commits)
flutter/engine@e3133e0 Reapply "Some cleanups enabled by removing support for Dart 1."
flutter/engine@1fb01f3 Roll src/third_party/skia a2bc1ca21bbc..7891994e89a3 (9 commits)
flutter/engine@f19ee56 Roll freetype2 to 6581fd3e9c8645f01c0d51e4f53893f5391f2bf3

* Ensure that the _childElements map is properly traversed as a sparse list and not inflated with garbage collected children.

* Add tests to ensure Lists/Tabs with KeepAlive children can make large jumps, don't lose children (including after rebuild).

* added shortcuts and delete functionality

* added first test

*  afew chnages

* a few changes

* hope this works

* small change

* small changes

* fixed nits

* final changes:

* fixed initializing formals

* update comment

* minor change:

* added line

* final changes

* random change

* changed function to void

* one more

* removed line

* dis betta work

* final change

* actual final chnge

Fixes #21250

https://github.com/flutter/engine/compare/269880b761a5...d52e5cca03fb

git log 269880b761a5..d52e5cca03fb --no-merges --oneline
d52e5cca0 Roll src/third_party/skia cd9d074578e0..a2bc1ca21bbc (8 commits) (flutter/engine#6211)


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https://github.com/flutter/engine/compare/1770f8854835...269880b761a5

git log 1770f8854835..269880b761a5 --no-merges --oneline
269880b76 Roll src/third_party/skia 40c7c64572bc..cd9d074578e0 (6 commits) (flutter/engine#6210)


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* [Material] Corrects default switch color.

* [Switch] Making black32 a local const.

* [Switch] Tests for default colors.

* [Switch] Correcting number for being over 255.

https://github.com/flutter/engine/compare/5c1a826eec4d...1770f8854835

git log 5c1a826eec4d..1770f8854835 --no-merges --oneline
1770f8854 Remove mention of Garnet/Topaz from license (flutter/engine#6209)


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https://github.com/flutter/engine/compare/e27a2e955bc3...5c1a826eec4d

git log e27a2e955bc3..5c1a826eec4d --no-merges --oneline
5c1a826ee Roll src/third_party/skia a3dc329d1db1..40c7c64572bc (1 commits) (flutter/engine#6208)
bf3c22419 Roll src/third_party/skia 2810c856dfa2..a3dc329d1db1 (1 commits) (flutter/engine#6206)
b9523318c Allow embedders to specify a custom GL proc address resolver. (flutter/engine#6204)
bf96dbed3 Revert "Some cleanups enabled by removing support for Dart. (#5621)" (flutter/engine#6205)
335811560 Roll src/third_party/skia 094b3eaf479c..2810c856dfa2 (6 commits) (flutter/engine#6203)
4c2448d15 Some cleanups enabled by removing support for Dart. (flutter/engine#5621)


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* Update fuchsia-tester so it takes map of kernel test files

* Set mainDart correctly. Cleanup nits.

* update gitignore template to mirror

* Add a newline to end of doc

* remove Android/ and iOS/ subfolder gitignores

Fixes https://github.com/flutter/flutter/issues/21215

* Fix Dropdown where icon not set to end of button

* Expand DropdownButton based on isExpanded flag

* Add dropdown golden tests

Fixes #13135, #16606

Now that Dart 1 support has been eliminated, generator should always be
populated to a kernel compiler instance.

Also moves the constructor to the top of the class, and orders final
fields before non-final fields, as dictated by the style guide.

This tickled a bug in KernelCompiler.compile() where the fingerprinter
doesn't include the outputFilePath in its list of dependencies. As such,
if the output .dill file is missing or corrupted, the fingerprint still
matches and re-compile is skipped, even though it shouldn't be. I'll fix
that in a followup, then look at how this triggered that issue. My
hypothesis is that that it's due to the aot kernel compile and bundle
kernel compile have separate output directories for the .dill files
(build/ vs build/aot) but the same output directory for the associated
depfiles (due to this patch).

This reverts commit 43a106e9.

This reverts commit 6e7f3e6f.

* added shortcuts and delete functionality

* added first test

*  afew chnages

* a few changes

* hope this works

* small change

* small changes

* fixed nits

* final changes:

* fixed initializing formals

* update comment

* minor change:

* added line

* final changes

The --snapshot argument was only necessary in Dart 1. The --depfile
argument was only used in Dart 2 mode to pass to the kernel compiler,
but was inconsistent with the 'build aot' command, where the depfile was
always set to build/kernel_compile.d.

This patch updates 'build bundle' to emit the depfile to a location
consistent with the 'build aot' command; since it's not intended to be
user-configurable and flutter.gradle hardcodes the location to
build/kernel_compile.d either way, this patch also eliminates the
ability to configure the filename altogether.

Revert "Revert "Enable taking screenshots of arbitrary RenderObjects from a running a… (#20637)" (#21395)" (#21448)

This reverts commit 5b5a5b82.

* lint unnecessary_new on samples

* fix tests