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This change is a preparation step to implement incremental tree updates and getting rid of needs_rebuild_visual_tree_. Changes made: - Introduced VisulTree inner class of DCLayerTree. Now VisualTree contains VisualSubtree's. - Moved logic responsible for building dcomp tree from DCLayerTree::BuildVisualTreeHelper to VisualTree::UpdateTree. - Removed DCLayerTree::root_surface_visual_. This reference is only used to add DelegatedInkVisual to the tree. Now this visual is locally cached within DCLayerTree::VisualTree::UpdateTree. - Introduced kDCVisualTreeOptimization feature. In subsequent CLs incremental tree updates will be implemented behind this feature. Bug: 1380822 Change-Id: If546629ed09d98f44e9826c8beec815653da79cd Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4051988 Reviewed-by: Sunny Sachanandani <sunnyps@chromium.org> Reviewed-by: Vasiliy Telezhnikov <vasilyt@chromium.org> Commit-Queue: Olga Gerchikov <gerchiko@microsoft.com> Cr-Commit-Position: refs/heads/main@{#1111973}
This directory contains UI frameworks used to build various user interface features. This directory is not intended to contain UI features (such as a keyboard).