Update svg's root paint offset property during paint

This patch updates the paint walk to update properties for SVG's
root which exists at the html->svg boundary. Paint properties are
typically updated in PaintLayerPainter but svg's root does not always
create a paint layer. A followup patch will update transform paint
properties created within SVG that may not have a PaintLayer either.

BUG=537409

Review URL: https://codereview.chromium.org/1655553002

Cr-Commit-Position: refs/heads/master@{#373279}
diff --git a/third_party/WebKit/LayoutTests/VirtualTestSuites b/third_party/WebKit/LayoutTests/VirtualTestSuites
index 408d9cf..e485ac6 100644
--- a/third_party/WebKit/LayoutTests/VirtualTestSuites
+++ b/third_party/WebKit/LayoutTests/VirtualTestSuites
@@ -204,6 +204,11 @@
     "args": ["--enable-slimming-paint-v2"]
   },
   {
+    "prefix": "spv2",
+    "base": "svg",
+    "args": ["--enable-slimming-paint-v2"]
+  },
+  {
     "prefix": "scalefactor200",
     "base": "fast/hidpi/static",
     "args": ["--force-device-scale-factor=2"]