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<!-- Please describe your changes on the following line: --> ---Part of #35867, per Step 5 suggestion. This PR: - Adds active_tab (via RefCell) to RootActor, updated in get_tab_msg_by_browser_id. - Adds browsing_context() helper to TabDescriptorActor. - Adds actor()`getter to TabDescriptorActorMsg for access in root.rs. -Creates the chain (Root - Tab - BrowsingContext) for routing colorSchemeSimulation. <!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `___` with appropriate data: --> - [X ] `./mach build -d` does not report any errors - [X ] `./mach test-tidy` does not report any errors - [ ] These changes fix #___ (GitHub issue number if applicable) <!-- Either: --> - [ ] There are tests for these changes OR - [X] These changes do not require tests because they’re structural setup for the actor chain and don’t change the system's behavior yet. <!-- Also, please make sure that "Allow edits from maintainers" checkbox is checked, so that we can help you if you get stuck somewhere along the way.--> <!-- Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process. --> --------- Signed-off-by: Uthman Yahaya Baba <uthmanyahayababa@gmail.com>