Implement SVG masking with slimming paint

LayoutTests/TestExpectations

Index: LayoutTests/TestExpectations
diff --git a/LayoutTests/TestExpectations b/LayoutTests/TestExpectations
index 35fd4e12a15a12ef8c283d71731b265e49f13111..4d94069a31c1f46c584d83f2f3e4e9083deca471 100644
--- a/LayoutTests/TestExpectations
+++ b/LayoutTests/TestExpectations
@@ -111,8 +111,6 @@ crbug.com/66751 [ Win ] http/tests/local/link-stylesheet-load-order.html [ Failu
 
 crbug.com/331566 fast/preloader/document-write-noscript.html [ Failure Pass ]
 
-crbug.com/451606 virtual/slimmingpaint/svg/filters/feSpecularLight-premultiplied.svg [ ImageOnlyFailure ]
-crbug.com/451606 virtual/slimmingpaint/svg/filters/filter-clip.svg [ ImageOnlyFailure ]
 crbug.com/451606 virtual/slimmingpaint/svg/filters/feComponentTransfer-subregion.svg [ Crash ImageOnlyFailure ]
 crbug.com/451606 virtual/slimmingpaint/svg/filters/feImage-animated-transform-on-target-rect.svg [ Crash ImageOnlyFailure ]
 crbug.com/451606 virtual/slimmingpaint/svg/filters/feImage-change-target-id.svg [ Crash ImageOnlyFailure ]
@@ -187,8 +185,6 @@ crbug.com/310679 [ Mac ] fast/frames/frame-set-scaling-hit.html [ Failure ImageO
 crbug.com/310679 [ Mac ] virtual/slimmingpaint/fast/frames/frame-set-rotation-hit.html [ Failure ImageOnlyFailure Pass ]
 crbug.com/310679 [ Mac ] virtual/slimmingpaint/fast/frames/frame-set-scaling-hit.html [ Failure ImageOnlyFailure Pass ]
 
-# These failures need to be investigated.
-crbug.com/412088 virtual/slimmingpaint/svg/foreignObject/mask.html [ ImageOnlyFailure ]
 # This needs a rebaseline after crbug.com/452967
 crbug.com/412088 virtual/slimmingpaint/svg/text/modify-text-node-in-tspan.html [ NeedsManualRebaseline ]
 crbug.com/412088 [ Mac Win7 ] virtual/slimmingpaint/svg/text/text-with-geometric-precision.svg [ Failure ]