Use an SVGElementProxy in ReferenceClipPathOperation
This transforms ReferenceClipPathOperation into using the SVGElementProxy
mechanism. Currently only for PaintLayer clients.
PaintLayerFilterInfo is generalized to PaintLayerResourceInfo and used as
the proxy/resource client for the 'clip-path' property. This enables change
notifications to flow back to the PaintLayer from the <clipPath> subtree.
The SVGElementProxySet is made a little bit generic by moving it to
SVGElementRareData, however it's still only made available for the few element
types that are used with it.
BUG=391604
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
Review-Url: https://codereview.chromium.org/2484153003
Cr-Commit-Position: refs/heads/master@{#432193}
26 files changed
