Adds support for mouse pointer hovering to trigger tooltips, as well as custom timeouts for the tooltip durations, and a custom decoration. It also makes the tooltip be fully opaque when shown, and fade in over 150ms, and fade out over 75ms, and draw a 4.0 corner radius, all to conform with the material spec. Prior to this change, it was using a corner radius of 2.0 when shown, and faded in and out over 200ms.

Fixes #22817

Fix a bug where text selection handles were invisible in iOS

* fix transform assert

https://github.com/flutter/engine/compare/e44c5d99c9f3...3a29e6a7a7dd

git log e44c5d99c9f3991afb73d55447725665e9dc236b..3a29e6a7a7dde7fbedef1b87a3d3a1605aca387f --no-merges --oneline
3a29e6a7a Plumb arguments from Settings to Dart main() (flutter/engine#8710)

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e44c5d99c Roll src/third_party/skia 2444c0e9aa23..10d172169f2d (1 commits) (flutter/engine#8740) (#31611)


https://github.com/flutter/engine/compare/1a8534cb9304...e44c5d99c9f3

git log 1a8534cb9304dd7d5f2c202f8abf422499f4b724..e44c5d99c9f3991afb73d55447725665e9dc236b --no-merges --oneline
e44c5d99c Roll src/third_party/skia 2444c0e9aa23..10d172169f2d (1 commits) (flutter/engine#8740)

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* Update packages
* Capture JSON RPC errors that presently get swallowed

https://github.com/flutter/engine/compare/26b30a464684...1a8534cb9304

git log 26b30a464684e7cbc1c76a98587154b9edb0c7a9..1a8534cb9304dd7d5f2c202f8abf422499f4b724 --no-merges --oneline
1a8534cb9 Revert "Increase the memory usage estimate for EngineLayer (#8700)" (flutter/engine#8738)
d2703b4ee Roll src/third_party/skia a1ab899e9e3f..2444c0e9aa23 (2 commits) (flutter/engine#8739)
0f47ab665 Roll src/third_party/skia 46d0f9aad1e6..a1ab899e9e3f (2 commits) (flutter/engine#8737)

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Previously benchmark_test.dart would break if run with --update-goldens.
Now the entire test suite can be run with --update-goldens.

https://github.com/flutter/engine/compare/3e47b4bb39bb...26b30a464684

git log 3e47b4bb39bb4993f03a278ea7b1c11ee6459b06..26b30a464684e7cbc1c76a98587154b9edb0c7a9 --no-merges --oneline
26b30a464 Roll src/third_party/skia 9adc82c73df0..46d0f9aad1e6 (41 commits) (flutter/engine#8736)
fdd8fdbf4 Fix reflective ctor invocation in FlutterFragment (flutter/engine#8735)
a56aa95e8 [scenic] Purge references to Mozart (flutter/engine#8712)
e4c439d37 Fix include paths in libtxt to prepare for upcoming Skia build change (flutter/engine#8723)
7c8ec376f Document that OpacityLayer's children are nonempty (flutter/engine#8707)
30fb4a697 Increase the memory usage estimate for EngineLayer (flutter/engine#8700)

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* Manual roll with updated test

Adds a feature of the native Android Time Picker to our Material Time Picker. When the user selects an hour, it automatically switches to minute mode.

This is a merging of two pull requests:

Code changes from @sdolski #24677
Tests from @lucaslcode #29876

Thanks to both of you for your contributions!

Fixes https://github.com/flutter/flutter/issues/31517

This PR introduces a number of changes and improvements to snack bars. This includes the ability to specify:

floating style of snack bars that adhere to the updated Material spec
elevation and shape on the SnackBar itself instead of relying on fixed values
a snackBarTheme as part of ThemeData which allows you to customize all of the above on an app-wide level.
This PR is includes the changes from #21484 as well as additional fixes and modifications. Thanks to @NikoYuwono for providing these changes and getting this off the ground!

Adds an adaptive constructor for the Material Slider. An adaptive widget is one that renders itself as Material on Android, and Cupertino on iOS. This work is based off of a similar feature on Switches: bbb080b3#diff-fe2bb980c6207699cbf45538fe927afa.

The motivation for this change is that we should provide adaptive constructors for as many widgets as necessary in the Material library. In Material, it is suggested that the slider is an iOS-style slider.

Cupertino localization step 8: create a gen_cupertino_localizations and generate one for cupertino english and french (#29824)

[Material] Update slider and slider theme with new sizes, shapes, and color mappings (2nd attempt) (#31564)

#30390 was rolled back. This PR will re-roll it forward.

This PR makes a number of changes to the visual appearance of material sliders:

Sizes/Shapes
** enabled thumb radius from 6 to 10
** disabled thumb radius from 4 to 10 with no gap
** default track shape is a rounded rect rather than a rect
**
Colors
** all of the colors now use the new color scheme
** overlay opacity has been reduce from 16% to 12%
** value indicator text color now respects the indicator it is on by using onPrimary
** disabledThumb color no respects the surface it is on by using onSurface
The slider theme is also now constructed consistently with other theme objects within the ThemeData. By default, all values are null, and have default values that are resolved in the slider itself, rather than in the slider theme.

Added info regarding matching lengths requirement and included links to sample implementation

Improve the error message shown when a TextField ends up with an unbounded width.

https://github.com/flutter/engine/compare/e27c867c30df...c63d1cf9c9ba

git log e27c867c30dfa24461a9fab356ff57a4bb22650e..c63d1cf9c9ba8c7d8546f24c1248433bdf827153 --no-merges --oneline
c63d1cf9c Roll src/third_party/skia 7ecad8791ff1..9adc82c73df0 (4 commits) (flutter/engine#8699)
62655b36e Roll src/third_party/skia f153e221140a..7ecad8791ff1 (1 commits) (flutter/engine#8697)
45a9d36c4 Roll src/third_party/skia 977b16d9c978..f153e221140a (3 commits) (flutter/engine#8696)

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This reverts commit 77ab0b83.

## Description

Clarify that ClipRect can be added to ensure that CustomPainter will be drawing within bounds.

## Related Issues

https://github.com/flutter/flutter/issues/31202

e27c867c3 Roll src/third_party/skia 731ba99a8581..977b16d9c978 (5 commits) (flutter/engine#8694) (#31475)


https://github.com/flutter/engine/compare/e1680c1e439f...e27c867c30df

git log e1680c1e439f3009767e94123aa21b6416246172..e27c867c30dfa24461a9fab356ff57a4bb22650e --no-merges --oneline
e27c867c3 Roll src/third_party/skia 731ba99a8581..977b16d9c978 (5 commits) (flutter/engine#8694)

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https://github.com/flutter/engine/compare/0523870e0bc6...e1680c1e439f

git log 0523870e0bc6f20101aa6e42e9e3fdf3adf513f0..e1680c1e439f3009767e94123aa21b6416246172 --no-merges --oneline
e1680c1e4 Roll src/third_party/dart cf4444b803..1f1592edce (49 commits)

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