This reverts commit 6ef80b44.

This is the continuation of https://github.com/flutter/engine/pull/11041 and https://github.com/flutter/flutter/pull/38574

This is not a breaking change as we're not removing `onReportTimings` API.
We're simply removing the use of it in our framework.

Filed: https://github.com/flutter/flutter/issues/38838
to track these usages.

This was introduced by: https://github.com/flutter/engine/pull/11041

Revert "Revert "redux of a change to use new engine APIs for Flutter.Frame events (#34365)" (#34514)" (#34530)

This reverts commit 8f75d537.

This reverts commit ceb09b8b.

This reverts commit 446179f6.

* update the Flutter.Frame event to use new engine APIs

* add a test

* update test

This reverts commit ab707aca.

Revert "Add currentSystemFrameTimeStamp to SchedulerBinding (#33886)"

This reverts commit 61b83d32.

Convert scheduling to use `scheduleMicrotask` instead of `Timer.run`

Make FlutterError objects more structured so they can be displayed better in debugging tools such as Dart DevTools.

git log --oneline --no-merges f4951df193a7966f9ed4da43d555eee0913d84d1..a48cd16e077778a7aa5908e4faa4da07714260f2
a48cd16e0 Update a11y word forward/back enum names (https://github.com/flutter/engine/pull/8073)
b5f59ed89 Delay the vsync callback till the frame start time specified by embedder. (https://github.com/flutter/engine/pull/8072)
7426305f5 Mark const extern (https://github.com/flutter/engine/pull/8077)
d3f6d7a21 only partial rule revert (https://github.com/flutter/engine/pull/8078)
d71bfe58d Only build a full Dart SDK when building for the host system (https://github.com/flutter/engine/pull/8071)
de90dbff7 Refactor web configuration/ Add dartdevc (https://github.com/flutter/engine/pull/7978)
ff46dd38f Roll src/third_party/skia 4c1ea43a79b5..88b8d1124b72 (8 commits) (https://github.com/flutter/engine/pull/8070)
80c6dd286 Roll src/third_party/skia 692122e3ef23..4c1ea43a79b5 (3 commits) (https://github.com/flutter/engine/pull/8069)
68ed654ea Roll src/third_party/skia 3c957d575c58..692122e3ef23 (6 commits) (https://github.com/flutter/engine/pull/8067)
ca0bac4fb Revert "add signal to pointer kinds" (https://github.com/flutter/engine/pull/8066)
3fb627f2c add signal to pointer kinds (https://github.com/flutter/engine/pull/8065)
5a06afa2a Roll src/third_party/skia 801a9c16d81e..3c957d575c58 (19 commits) (https://github.com/flutter/engine/pull/8063)
a93d99db9 A11y callback (https://github.com/flutter/engine/pull/8005)
3661d5e43 Re-land "Buffer lifecycle in WindowData" (https://github.com/flutter/engine/pull/8032)
471a2c89a Send scroll events from the macOS shell (https://github.com/flutter/engine/pull/8056)
2fe9c9b5f Roll src/third_party/skia 72542816cadb..801a9c16d81e (46 commits) (https://github.com/flutter/engine/pull/8060)
3335764ae Skip skp files in license check (https://github.com/flutter/engine/pull/8050)
7f16789b2 Remove redundant thread checker in FML. (https://github.com/flutter/engine/pull/8053)
840c5233a Correct URL for Cirrus CI build status badge (https://github.com/flutter/engine/pull/8054)
57c120a29 remove extra source files (https://github.com/flutter/engine/pull/8052)
4773375c6 Used named conditionals for platform specific dependencies and suppress Android and Windows hooks on Mac. (https://github.com/flutter/engine/pull/8051)
70a18b515 Add clang static analysis support to gn wrapper (https://github.com/flutter/engine/pull/8047)
b30f9897b Improve elevation bounds for physical shape layers (https://github.com/flutter/engine/pull/8044)
e37bd27b4 Fix weak pointer use violations in shell and platform view. (https://github.com/flutter/engine/pull/8046)
dd80fc9ff Add engine support for scrollwheel events (https://github.com/flutter/engine/pull/7494)

* 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

Fix the spelling errors in the dartdocs for the framework.

There are no functionality changes here, just documentation fixes.

Before this, we had several places where an isReleaseMode was defined, all with the same definition. This just makes it more broadly visible to allow our users to use it, as well as creating debug and profile versions, and adding a device lab test for it.

Since this is a const value, this makes it possible for a developer to easily mark blocks that can be removed at AOT compile time.

This reverts commit 8e2ca93f.

Fixes https://github.com/flutter/flutter/issues/23172

This re-lands 3c56e6c7 on top of a new Dart SDK that contains new mixin syntax fixes.

* Future<void> main

* Future<void>.delayed

* prefer_void_to_Null

* address review comments

Service extensions can only be activated in debug or profile mode, their code should never be included in release mode. This PR adds guards around all service extension registration calls that enable Dart's tree shaker to remove the extension's code in release mode, which reduces our binary size:

Android Snapshot (uncompressed): minus 127,384 Bytes (-124.40KB)
APK (compressed): minus 38,136 Bytes (-37.24KB)
iOS Snapshot (App.framework, uncompressed): 264,304 Bytes(-258.10KB)

For details: https://docs.google.com/document/d/13JlgvliCn5sWwT2K2SfDwD1NhEfxpJH9DCf22gZZru8/edit

**Benchmark Regressions:** This PR may cause benchmarks to regress because it may change the timing of GC. If you notice a benchmark regression **please note down the exact set of benchmarks that regressed on this PR** and then feel free to revert. I will follow-up with a PR that forces a GC before the effected benchmarks run to get a clean baseline before re-applying this PR.

This reverts commit 3c56e6c7.

It breaks the AOT build.

* first pass

* revert WidgetsBindingObserver

* disable prefer_mixin

* docs and more mixins

* newer engine; binding fixes

* upgrade dependencies

* fix test binding

* remove whitespace

* remove the obsolete `enableSuperMixins: true`

* upgrade dartdoc to 0.22.0

* temporarily use git version of dartdoc

* fix pub global activate syntax

* use dartdoc 0.23.0