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This CL implements the IRawElementProviderAdviseEvents UIA interface to limit event firing to only those actively listened to by UIA clients. The interface is implemented on AXPlatformNodeWin, but per UIA documentation, its methods are only invoked on the fragment root. To achieve this, AXFragmentRootWin now maintains two unordered_maps -- one for EVENTIDs and another for PROPERTYIDs. Before firing an event, we check if a UIA client has registered interest in it within the fragment tree, reducing unnecessary event processing and improving performance. While we manually tested that we're always firing the required events when an assistive technology is listening in, we're adding a killswitch to turn off the feature remotely in case unexpected problems are discovered in prod. Bug: 40919326, 401016023, 402375302 Change-Id: I18554f50e59a1013452c691c3f310f2629835b59 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6337330 Reviewed-by: Greg Thompson <grt@chromium.org> Commit-Queue: Benjamin Beaudry <benjamin.beaudry@microsoft.com> Cr-Commit-Position: refs/heads/main@{#1432231}
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