This reverts commit 602d8baf.

* move pending timers list code out of assert

* style change
Co-authored-by: Emmanuel Garcia <egarciad@google.com>

* add unit tests

* formatting

* pending timer test

* pending timer assertion test

* add setup and teardown
Co-authored-by: Emmanuel Garcia <egarciad@google.com>

Reland: #56167

 For files larger than 250 KB (roughly the size of framework.dart), chunk the conversion. This may be important for large assets like images.

The Linux CMakeLists.txt are intended to be compatible with 3.10, but
accedintally used a list construct that wasn't added until 3.12. This
adds a custom replacement function.

This makes the build compatible with 3.10 as originally intended.

* Value Indicator uses Global position when calculating horizontal position

* fixed test

* fixed analyzer

* Made globalCenter variable and added comments

- OsError now implements exception, remove workaround.
- Prefer is check to catching TypeError

Treats 'pluginClass: none' as equivalent to having no 'pluginClass'
entry on the desktop platforms, to satisy stable channel plugin
validation of Dart-only desktop plugin implementations. See
issue for full details.

Part of https://github.com/flutter/flutter/issues/57497

* Bump flutter_gallery_assets version to ^0.2.0.

* Run `flutter update-packages --force-upgrade`.

* Add comment.

* Remove duplicate key.

To simplify development of the in-progress GTK embedding, which will
replace the GLFW embedding on Linux, add the GTK artifacts to the unpack
list. This means that until the transition, both the GLFW and GTK
artifacts will be unpacked.

Part of #54860

The -S/-B format of specifying source and build directories wasn't added
until 3.13. For 3.10 compatibility, use the older form of having the
working directory as the build directory, and the last argument as the
source directory.

Fixes #57409

Throw a toolExit if the windows plugin logic runs on an invalid windows project. Update the supported project check to validate the existence of a Runner.sln file

Updates the Linux templates to use CMake+ninja, rather than Make, and updates the tooling to generate CMake support files rather than Make support files, and to drive the build using cmake and ninja.

Also updates doctor to check for cmake and ninja in place of make.

Note: While we could use CMake+Make rather than CMake+ninja, in testing ninja handled the tool_backend.sh call much better, calling it only once rather than once per dependent target. While it does add another dependency that people are less likely to already have, it's widely available in package managers, as well as being available as a direct download. Longer term, we could potentially switch from ninja to Make if it's an issue.

Fixes #52751