Fixes flutter#182501

Right now empty `TaskRunner::ProcessTasks()` returns
`TaskTimePoint::max() - now` (relative time). This causes problems,
because the value is later used in `TaskRunnerWindow` to schedule timer
at `std::chrono::high_resolution_clock::now() + relative_time`). This of
course overflows, because the new `now()` in `TaskRunnerWindow` is
higher than the value used to calculate original delta inside
`TaskRunner`.

`TaskRunnerWindow` already had special case where it checks for
`std::chrono::nanoseconds::max()`. In this PR the behavior of
`TaskRunnerWindow::SetTimer` has been updated to check for overflow
rather than excepcting a special value.

*If you had to change anything in the [flutter/tests] repo, include a
link to the migration guide as per the [breaking change policy].*

## Pre-launch Checklist

- [x] I read the [Contributor Guide] and followed the process outlined
there for submitting PRs.
- [x] I read the [Tree Hygiene] wiki page, which explains my
responsibilities.
- [x] I read and followed the [Flutter Style Guide], including [Features
we expect every widget to implement].
- [x] I signed the [CLA].
- [x] I listed at least one issue that this PR fixes in the description
above.
- [x] I updated/added relevant documentation (doc comments with `///`).
- [x] I added new tests to check the change I am making, or this PR is
[test-exempt].
- [x] I followed the [breaking change policy] and added [Data Driven
Fixes] where supported.
- [x] All existing and new tests are passing.

If you need help, consider asking for advice on the #hackers-new channel
on [Discord].

**Note**: The Flutter team is currently trialing the use of [Gemini Code
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Comments from the `gemini-code-assist` bot should not be taken as
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useful you can update your code accordingly, but if you are unsure or
disagree with the feedback, please feel free to wait for a Flutter team
member's review for guidance on which automated comments should be
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<!-- Links -->
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[Flutter Style Guide]:
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[Features we expect every widget to implement]:
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[CLA]: https://cla.developers.google.com/
[flutter/tests]: https://github.com/flutter/tests
[breaking change policy]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#handling-breaking-changes
[Discord]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Chat.md
[Data Driven Fixes]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Data-driven-Fixes.md

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Roll Flutter from dad6f9d4107a to b31548feb941 (39 revisions)

flutter/flutter@dad6f9d...b31548f

2026-02-25 [email protected] [web] Fix failure on Firefox 148 (flutter/flutter#182855)
2026-02-25 [email protected] Roll Fuchsia Linux SDK from KfPgw04T0OEADLJA5... to XI0Ax7fbtYE4XKYAQ... (flutter/flutter#182887)
2026-02-25 [email protected] Use AnimationStyle curve and reverseCurve in ModalBottomSheet animation (flutter/flutter#181403)
2026-02-25 [email protected] Roll Dart SDK from fd3dce5b6a4e to 5c57e75f1102 (9 revisions) (flutter/flutter#182801)
2026-02-25 98614782+auto-submit[bot]@users.noreply.github.com Reverts "refactor: remove material in context_menu_controller_test, icon_test, list_wheel_scroll_view_test, media_query_test, platform_menu_bar_test (#182697)" (flutter/flutter#182879)
2026-02-25 [email protected] Make sure that an AnimatedSlide doesn't crash in 0x0 environment (flutter/flutter#181535)
2026-02-24 [email protected] Reland Standardize on Test* widgets in *_tester.dart files (flutter/flutter#182632)
2026-02-24 [email protected] docs(Path): clarify that zero-length contours are excluded from computeMetrics (flutter/flutter#180165)
2026-02-24 [email protected] Fix typo in assert message (flutter/flutter#182843)
2026-02-24 [email protected] [win32] Fix overflow in TaskRunnerWindow. (flutter/flutter#182822)
2026-02-24 [email protected] feat: Add --no-uninstall flag to flutter test for integration tests (flutter/flutter#182714)
2026-02-24 [email protected] Rename noFrequencyBasedMinification to useFrequencyBasedMinification (flutter/flutter#182684)
2026-02-24 [email protected] [Impeller] Fix fail to render pixel buffer texture on Linux (flutter/flutter#181656)
2026-02-24 [email protected] Remove FlutterFramework app migration (flutter/flutter#182100)
2026-02-24 [email protected] Roll Packages from 12b43a1 to 062c8d4 (5 revisions) (flutter/flutter#182839)
2026-02-24 [email protected] [web] Run webparagraph tests in CI (flutter/flutter#182092)
2026-02-24 [email protected] Fix a race in EmbedderTest.CanSpecifyCustomUITaskRunner (flutter/flutter#182649)
2026-02-24 [email protected] flutter_tools: Use a super-parameter in several missed cases (flutter/flutter#182581)
2026-02-24 [email protected] Replace more references to `flutter/engine` with `flutter/flutter` (flutter/flutter#182654)
2026-02-24 [email protected] Carousel: Migration from Scrollable+Viewport to CustomScrollView (flutter/flutter#182475)
2026-02-24 [email protected] Refactor impellerc_main to better organize some of its logic (flutter/flutter#182783)
2026-02-24 [email protected] Remove unused `getPluginList ` (flutter/flutter#182660)
2026-02-24 [email protected] Refactor: Remove material from ticker provider test (flutter/flutter#181697)
2026-02-24 [email protected] Roll Skia from 26eebffe12bd to f44d7db68805 (3 revisions) (flutter/flutter#182821)
2026-02-24 [email protected] refactor: remove material in context_menu_controller_test, icon_test, list_wheel_scroll_view_test, media_query_test, platform_menu_bar_test (flutter/flutter#182697)
2026-02-24 [email protected] Roll Skia from 7dad66aae75a to 26eebffe12bd (5 revisions) (flutter/flutter#182810)
2026-02-24 [email protected] Update roadmap for 2026 (flutter/flutter#182798)
2026-02-24 [email protected] Marks Windows tool_tests_commands_1_2 to be unflaky (flutter/flutter#179670)
2026-02-23 [email protected] [web] scroll iOS iframe text input into view (flutter/flutter#179759)
2026-02-23 [email protected] Fix textscaler clamp assertion error (flutter/flutter#181716)
2026-02-23 [email protected] Roll Skia from 9a5a3c92c336 to 7dad66aae75a (4 revisions) (flutter/flutter#182779)
2026-02-23 [email protected] Move more getters from userMessages class to the appropriate places (flutter/flutter#182656)
2026-02-23 [email protected] Manual roll Dart SDK from f8fac50475b8 to fd3dce5b6a4e (6 revisions) (flutter/flutter#182768)
2026-02-23 [email protected] Copy Flutter framework to Add to App FlutterPluginRgistrant (flutter/flutter#182523)
2026-02-23 [email protected] Add progress indicator to artifact downloads (flutter/flutter#181808)
2026-02-23 [email protected] Clarify batch release mode requirements (flutter/flutter#182228)
2026-02-23 [email protected] [web] Remove --disable-gpu from flutter chrome tests (flutter/flutter#182618)
2026-02-23 [email protected] running-apps: update running-apps to use Duration.ago() (flutter/flutter#182172)
2026-02-23 [email protected] Refactor bin/ shell scripts for better performance and safety (flutter/flutter#182674)

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/flutter-packages
Please CC [email protected],[email protected] on the revert to ensure that a human
is aware of the problem.

...

Fixes flutter#182501

Right now empty `TaskRunner::ProcessTasks()` returns
`TaskTimePoint::max() - now` (relative time). This causes problems,
because the value is later used in `TaskRunnerWindow` to schedule timer
at `std::chrono::high_resolution_clock::now() + relative_time`). This of
course overflows, because the new `now()` in `TaskRunnerWindow` is
higher than the value used to calculate original delta inside
`TaskRunner`.

`TaskRunnerWindow` already had special case where it checks for
`std::chrono::nanoseconds::max()`. In this PR the behavior of
`TaskRunnerWindow::SetTimer` has been updated to check for overflow
rather than excepcting a special value.

*If you had to change anything in the [flutter/tests] repo, include a
link to the migration guide as per the [breaking change policy].*

## Pre-launch Checklist

- [x] I read the [Contributor Guide] and followed the process outlined
there for submitting PRs.
- [x] I read the [Tree Hygiene] wiki page, which explains my
responsibilities.
- [x] I read and followed the [Flutter Style Guide], including [Features
we expect every widget to implement].
- [x] I signed the [CLA].
- [x] I listed at least one issue that this PR fixes in the description
above.
- [x] I updated/added relevant documentation (doc comments with `///`).
- [x] I added new tests to check the change I am making, or this PR is
[test-exempt].
- [x] I followed the [breaking change policy] and added [Data Driven
Fixes] where supported.
- [x] All existing and new tests are passing.

If you need help, consider asking for advice on the #hackers-new channel
on [Discord].

**Note**: The Flutter team is currently trialing the use of [Gemini Code
Assist for
GitHub](https://developers.google.com/gemini-code-assist/docs/review-github-code).
Comments from the `gemini-code-assist` bot should not be taken as
authoritative feedback from the Flutter team. If you find its comments
useful you can update your code accordingly, but if you are unsure or
disagree with the feedback, please feel free to wait for a Flutter team
member's review for guidance on which automated comments should be
addressed.

<!-- Links -->
[Contributor Guide]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#overview
[Tree Hygiene]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md
[test-exempt]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#tests
[Flutter Style Guide]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md
[Features we expect every widget to implement]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md#features-we-expect-every-widget-to-implement
[CLA]: https://cla.developers.google.com/
[flutter/tests]: https://github.com/flutter/tests
[breaking change policy]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#handling-breaking-changes
[Discord]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Chat.md
[Data Driven Fixes]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Data-driven-Fixes.md