Put SVGResourceContainer subtypes into their own property trees.

third_party/WebKit/LayoutTests/platform/win/paint/invalidation/svg/js-late-pattern-and-object-creation-expected.txt

 {
   "layers": [
     {
       "name": "LayoutView #document",
       "bounds": [800, 600],
       "contentsOpaque": true,
       "drawsContent": true,
       "paintInvalidations": [
         {
           "object": "LayoutSVGContainer g id='content'",
           "rect": [0, 15, 684, 362],
           "reason": "became visible"
         },
         {
           "object": "LayoutSVGRect rect",
-          "rect": [16, 16, 18, 18],
+          "rect": [10, 10, 10, 10],
           "reason": "layoutObject insertion"
         },
         {
           "object": "LayoutSVGRect rect",
-          "rect": [16, 16, 18, 18],
+          "rect": [10, 10, 10, 10],
           "reason": "layoutObject insertion"
         },
         {
           "object": "LayoutSVGRect rect",
-          "rect": [8, 8, 17, 17],
+          "rect": [5, 5, 10, 10],
           "reason": "layoutObject insertion"
         },
         {
           "object": "LayoutSVGRect rect",
-          "rect": [8, 8, 17, 17],
+          "rect": [5, 5, 10, 10],
           "reason": "layoutObject insertion"
         }
       ]
     }
   ],
   "objectPaintInvalidations": [
     {
       "object": "LayoutSVGResourcePattern pattern id='fillPattern'",
       "reason": "layoutObject insertion"
     },
@@ skipping 65 matching lines @@
       "object": "LayoutSVGInlineText #text",
       "reason": "layoutObject insertion"
     },
     {
       "object": "InlineTextBox 'Pattern on fill/stroke'",
       "reason": "layoutObject insertion"
     }
   ]
 }