This reverts commit 468471bf.

* 98068f17a fuchsia: Only send different ViewProperties (flutter/engine#26170)

* 5e487ba85 Roll Skia from c1f641104531 to 469531234936 (4 revisions) (flutter/engine#26197)

* 4cab492e4 Add image generator registry (flutter/engine#25987)

* c753c2413 Roll Fuchsia Linux SDK from l6XmTSLnt... to AUWVgDkx6... (flutter/engine#26201)

* 75a7812eb Reland outputs a json version of the package manifest. (flutter/engine#26163)

* b5dc598c7 Roll Skia from 469531234936 to 5b38536d76ae (7 revisions) (flutter/engine#26202)

* fb913661c [icu] Upgrade ICU to 69.1, the same commit used by Chromimum latest (flutter/engine#26200)

* 62e095122 Prepare to move --delete-tostring-package-uri option to Dart SDK (flutter/engine#26196)

* 156c2bebc Web ImageFilter.matrix support (flutter/engine#25982)

* c30de25f3 Roll Skia from 5b38536d76ae to 2fed9f62d29a (7 revisions) (flutter/engine#26206)

* 7ef42f14d Roll Fuchsia Mac SDK from KmSY84b_E... to 7WNQRHsHN... (flutter/engine#26207)

* 8bba964f9 Add more diagrams for deferred components docs, fix alignment of existing one (flutter/engine#26209)

* 391e22dcb Roll Dart SDK from 67be110b5ba8 to 510f26486328 (3 revisions) (flutter/engine#26212)

* fa62ce08b Roll Skia from 2fed9f62d29a to e8cd0a54041e (2 revisions) (flutter/engine#26213)

* 2029cbafc Roll Skia from e8cd0a54041e to 3d854bade6de (4 revisions) (flutter/engine#26216)

* 9cd3c6491 Roll Fuchsia Linux SDK from AUWVgDkx6... to boele8geO... (flutter/engine#26217)

* 6ceab157d Roll Dart SDK from 510f26486328 to 13e329e614f2 (1 revision) (flutter/engine#26218)

* f90698a89 Roll Fuchsia Mac SDK from 7WNQRHsHN... to F5TX4MaEg... (flutter/engine#26220)

* b9d03fed2 Roll Skia from 3d854bade6de to 66125eac158d (1 revision) (flutter/engine#26221)

* 849ce7e6b Roll Dart SDK from 13e329e614f2 to 2eea032403e2 (1 revision) (flutter/engine#26222)

* ca89d6913 Roll Skia from 66125eac158d to 5696bcd0f7f8 (1 revision) (flutter/engine#26223)

* db7a3dc09 fuchsia: Fix occlusion_hint handling (flutter/engine#26208)

* b875d99dc Roll Skia from 5696bcd0f7f8 to bdfd77616177 (5 revisions) (flutter/engine#26224)

* b67caca64 Roll Skia from bdfd77616177 to fb8d20befa8f (1 revision) (flutter/engine#26225)

* 2398dea91 Revert Dart SDK to 67be110b5ba8fc84af5e7136389e52a13ccbc9d5 (flutter/engine#26232)

They should have been taking a PointerDownEvent.

This change was originally included in #81884, but that
had to be reverted because it broke Google testss. This
sub-part of that larger change needs to be made first in
order to allow for a phased rollout in a way that won't
break Google tests.

https://github.com/flutter/flutter/issues/81883

This reverts commit e88a387b.

* Gesture recognizer cleanup

1) Make OneSequenceGestureRecognizer.addAllowedPointer()
   call startTrackingPointer(), and change subclasses to
   call super.addAllowedPointer() in place of manually
   calling startTrackingPointer().
2) Fix addAllowedPointer overrides to take PointerDownEvent
   where some were taking PointerEvent.
3) Add API documentation to OneSequenceGestureRecognizer
4) Make the following fields in OneSequenceGestureRecognizer
   private with public getters instead of publicly writable:
   `state`, `primaryPointer`, and `initialPosition`.
5) Clean up gesture recognizer state in
   OneSequenceGestureRecognizer.didStopTrackingLastPointer.

Fixes #81883