Added ExpansionTileController

Add support for secondary tab bar

Adds a check for the case where a device has no battery present. The
devicelab test expects the text "No battery." in the case where a device
has no battery. This is triggered by returning an error with a
NO_BATTERY error code.

Also applies some cosmetic fixes:
* Amends a copyright notice to Flutter instead of com.example
* Deletes an unused test.

Issue: https://github.com/flutter/flutter/issues/79204

Roll pub packages

Adds a macOS implementation of the platform_channel example,
demonstrating method channels and event channels with a battery power
plugin.

Adds platform_channel_sample_test_macos macOS host test to verify the
sample works.

Issue: https://github.com/flutter/flutter/issues/79204

Remove 1745 decorative breaks

Documentation improvements

Fix Gradle warning in a freshly `flutter create`ed Android project

Bump lower Dart SDK constraints to 3.0 & add class modifiers

manual pub roll

* add shadowColor property

* add to bottom app bar

* basic MCU connection demo

* more image tests

* demo update

* remove branch changes

* demo cleanup

* cleanup

* update algo

* working consistent example

* demo cleanup

* Added tests

* fix merge

* rebase

* basic MCU connection demo

* more image tests

* demo update

* remove branch changes

* demo cleanup

* cleanup

* update algo

* working consistent example

* demo cleanup

* Added tests

* lint fixes

* fix theme error

* whitespace fixes

* revert old commit

* update test formatting

* modify image source to external repo

* remove pngs

* add blank line

* fix web tests

* comment responses

* remove whitespace

* whitespace

* whitespace

Revert unintentional changes to Info.plist files

Add support for application exit requests

Add macos project auto migration code for FlutterApplication

Add one DefaultTextStyle example

SystemUiOverlayStyle, add two examples and improve documentation

Add support for iOS UndoManager

Add ZoomPageTransitionsBuilder.allowSnapshotting

Roll pub packages

Cleanup PageTransitionsTheme documentation and add one example

`OverlayPortal` 

Roll pub packages

Update date picker examples, remove unused variables and add missing tests

fixes Show Week Day in CupertinoDatePicker with CupertinoDatePickerMo…

Roll pub packages

Add `OverflowBox` example and update existing examples under `basic.dart`

* Fix typos

* lowercase animated & opacity

* Undo typo fix

---------
Co-authored-by: Michael Goderbauer <goderbauer@google.com>

This reverts commit 7ba44065.

* Add ActionButtonIconsData for overriding action icons

* Fix formatting issues

* Add missing exports in material library and add copyWith method in ActionButtonIconsData

* Move all action buttons, and icons to action_buttons.dart

* Rename actionButtonIcons to actionIconTheme

* Refactor buttons in action_buttons.dart to extend a private class for common implementation

* Refactor icons in action_buttons

* Fix docs in action_buttons_theme

* Fix #107646 always use 'Icons.arrow_back' as a back_button icon in web

* Update documentation for action buttons and add style parameter to every action button

* Fix analyzer warnings

* Add missing style argument in IconButton of _ActionButton

* Add tests for action buttons, action icon theme, drawer buttons, and back buttons

* Add example (+test) for action icon button's action icon theme in examples/api

* Fix analysis errors

* Add missing license header in action_icon_theme.0.dart

* Fix deprecation notice in theme_data.dart

* Update theme data tests for actionIconTheme

* Remove iconSize parameter from ActionButtons and update docs

* Fix failing tests

* Update button color during backbutton tests to red

* Fix analytics issues

* Fix format

* Remove more references to dart:ui.window

* two more doc referenes

* revert icon_color_test.dart

* lerp documentation

* Remove Note, Note That from repo

* Improve BorderSide documentation.

* apply review comments

* add actionOverflowThreshold param

* analyzer tings

* https://www.youtube.com/watch?v=NPwyyjtxlzU

* remove erroneous switch changes

* rename test

* remove unwanted switch.dart diff

* remove redundant values

* review changes

---------
Co-authored-by: schectman <schectman@google.com>