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This patch extracts a HitTestingTreeNode from AsyncPanZoomController. The tree formed by these nodes is very similar in structure to the APZC tree that we had previously. The main difference is that we can have multiple HitTestingTreeNode instances per APZC; each HitTestingTreeNode corresponds to a different layer with the same metrics. This is a first step in extracting the hit-test data entirely from the AsyncPanZoomController class and having a 1:1 mapping with the layer tree. |
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