Hi! I am working on a proposal for an accessibility module that takes snapshots of the screen and annotates them through a local image processing module. To do so, I need to have triggers that say "this region of the screen is updated". I've looked into several positions for the trigger (like ui::Window::SchedulePaintInRect oand cc::AsyncLayerTreeFrameSink::SubmitCompositorFrame) but could not find a place that gives me the content area rectangles that are updated. I would appreciate any pointers on where to look.
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