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cc: Make impl-thread property trees handle fixed-position layers
This makes impl-thread property trees correctly handle fixed-position layers, as long as there's no bounds_delta (handling bounds_delta is left for another CL). This CL makes the offset between a fixed-position layer and its container unchangeable on the compositor thread, so that it remains unaffected by impl scrolling of intermediate layers. This also changes the transform node used as the parent of a fixed-position node when the fixed-position container is scrollable: since scrolls of this container aren't supposed to affect contained fixed-position layers, yet do contribute to this node's local transform, this node's parent is used as the transform tree parent of contained fixed-position nodes. This makes the portions of LayerPostionConstraintTests that do not involve bounds_delta pass with verification enabled. BUG=481585 CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel Review URL: https://codereview.chromium.org/1144993004 Cr-Commit-Position: refs/heads/master@{#332055}
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