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The DisplayListBuilder now tracks the blend mode(s) used for its contents and whether it contains a child SaveLayer that uses a backdrop filter - both conditions that could require the graphics engine to use a different type of layer to satisfy the requests. blend modes are tracked as the "highest" blend mode enum used by any content (defaults to kClear) as the enum values tend to be ordered so that larger values will tend to require more complicated render-target accesses. The root layer of the DisplayList can be queried for both conditions on the root layer using methods on the DisplayList class.