[SVG] Re-enable experimental PathOpsSVGClipping support

LayoutTests/TestExpectations

 #
 # turn off Slimming Paint tests for all non-Linux platforms...
 crbug.com/453972 virtual/slimmingpaint/ [ Skip ]
 # except for fast/block/, as a sanity test directory.
 crbug.com/453972 virtual/slimmingpaint/fast/block [ Pass ]
 # On linux, also run the following listed directories.
 crbug.com/453972 [ Linux ] virtual/slimmingpaint/fast/backgrounds [ Pass ]
 crbug.com/453972 [ Linux ] virtual/slimmingpaint/fast/borders [ Pass ]
 crbug.com/453972 [ Linux ] virtual/slimmingpaint/fast/gradients [ Pass ]
 crbug.com/453972 [ Linux ] virtual/slimmingpaint/fast/repaint [ Pass ]
@@ skipping 379 matching lines @@
 crbug.com/492664 [ Linux Android Win ] imported/csswg-test/css-writing-modes-3/text-orientation-script-001k.html [ Failure ]
 crbug.com/492664 [ Linux Android Win ] imported/csswg-test/css-writing-modes-3/text-orientation-script-001m.html [ Failure ]
 crbug.com/496848 [ Mac ] imported/csswg-test/css-writing-modes-3/text-orientation-script-001k.html [ Failure Crash ]
 crbug.com/496848 [ Mac ] imported/csswg-test/css-writing-modes-3/text-orientation-script-001m.html [ Failure Crash ]
 crbug.com/492664 imported/csswg-test/css-writing-modes-3/text-orientation-script-001n.html [ Failure ]
 crbug.com/492664 imported/csswg-test/css-writing-modes-3/writing-mode-stretch-001.html [ ImageOnlyFailure ]
 crbug.com/492664 imported/csswg-test/css-writing-modes-3/text-combine-upright/text-decoration-001.htm [ ImageOnlyFailure ]
 crbug.com/492664 imported/csswg-test/css-writing-modes-3/text-combine-upright/text-emphasis-001.htm [ ImageOnlyFailure ]
 crbug.com/492664 imported/csswg-test/css-writing-modes-3/text-combine-upright/value-all-and-inherit-001.htm [ ImageOnlyFailure ]
 
+# https://codereview.chromium.org/1185383002
+crbug.com/263911 svg/W3C-SVG-1.1/masking-intro-01-f.svg [ NeedsRebaseline ]
+crbug.com/263911 svg/W3C-SVG-1.1/masking-path-01-b.svg [ NeedsRebaseline ]
+crbug.com/263911 svg/clip-path/clip-path-child-clipped.svg [ NeedsRebaseline ]
+crbug.com/263911 svg/clip-path/clip-path-css-transform-1.svg [ NeedsRebaseline ]
+crbug.com/263911 svg/clip-path/clip-path-evenodd-nonzero.svg [ NeedsRebaseline ]
+crbug.com/263911 svg/clip-path/clip-path-evenodd.svg [ NeedsRebaseline ]
+crbug.com/263911 svg/clip-path/clip-path-nonzero-evenodd.svg [ NeedsRebaseline ]
+crbug.com/263911 svg/clip-path/clip-path-nonzero.svg [ NeedsRebaseline ]
+crbug.com/263911 svg/clip-path/clip-path-transform-1.svg [ NeedsRebaseline ]
+crbug.com/263911 svg/clip-path/clipper-placement-issue.svg [ NeedsRebaseline ]
+crbug.com/263911 svg/custom/masking-clipping-hidpi.svg [ NeedsRebaseline ]
+crbug.com/263911 svg/repaint/mask-clip-target-transform.svg [ NeedsRebaseline ]
+crbug.com/263911 svg/zoom/page/zoom-clip-path.html [ NeedsRebaseline ]
+
 # These tests pass but images do not match because of position: absolute in vertical flow bug
 crbug.com/492664 imported/csswg-test/css-writing-modes-3/block-flow-direction-009.xht [ ImageOnlyFailure ]
 crbug.com/492664 imported/csswg-test/css-writing-modes-3/clip-rect-vlr-003.xht [ ImageOnlyFailure ]
 crbug.com/492664 imported/csswg-test/css-writing-modes-3/clip-rect-vlr-005.xht [ ImageOnlyFailure ]
 crbug.com/492664 imported/csswg-test/css-writing-modes-3/clip-rect-vlr-007.xht [ ImageOnlyFailure ]
 crbug.com/492664 imported/csswg-test/css-writing-modes-3/clip-rect-vlr-009.xht [ ImageOnlyFailure ]
 crbug.com/492664 imported/csswg-test/css-writing-modes-3/clip-rect-vrl-002.xht [ ImageOnlyFailure ]
 crbug.com/492664 imported/csswg-test/css-writing-modes-3/clip-rect-vrl-004.xht [ ImageOnlyFailure ]
 crbug.com/492664 imported/csswg-test/css-writing-modes-3/clip-rect-vrl-006.xht [ ImageOnlyFailure ]
 crbug.com/492664 imported/csswg-test/css-writing-modes-3/clip-rect-vrl-008.xht [ ImageOnlyFailure ]
@@ skipping 1564 matching lines @@
 
 crbug.com/495523 [ XP ] svg/W3C-SVG-1.1/animate-elem-52-t.svg [ Failure ]
 crbug.com/495523 [ XP ] svg/W3C-SVG-1.1/extend-namespace-01-f.svg [ Failure ]
 crbug.com/495523 svg/wicd/test-rightsizing-b.xhtml [ Pass Failure ]
 
 crbug.com/424338 [ XP ] tables/mozilla/bugs/bug3037-1.html [ Failure ]
 
 crbug.com/490141 [ SnowLeopard ] compositing/layer-creation/fixed-position-in-fixed-overflow.html [ NeedsRebaseline ]
 crbug.com/497950 [ SnowLeopard ] virtual/antialiasedtext/fast/text/international/pop-up-button-text-alignment-and-direction.html [ NeedsRebaseline ]
 crbug.com/453972 [ XP ] paint/frames/frameset-with-stacking-contexts.html  [ NeedsRebaseline ]