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We ignored position of mask layers before crrev.com/697315 by always
setting the mask layer's offset_to_transform_parent and property tree
state to the same as the masked layer. As we removed the special
handling code for mask layers from PropertyTreeBuilder, now we ignore
position of mask layers in Layer::SetPosition() to keep the original
behavior.

Bug: 100532
Change-Id: I2c9def5e139ea6a3c798593f8f0c2a219d2bdc8b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1810844Reviewed-by: Philip Rogers <pdr@chromium.org>
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697808}