Put SVGResourceContainer subtypes into their own property trees.

third_party/WebKit/LayoutTests/platform/mac/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, 14, 678, 366],
           "reason": "became visible"
-        },
-        {
-          "object": "LayoutSVGRect rect",
-          "rect": [16, 16, 18, 18],
-          "reason": "layoutObject insertion"
-        },
-        {
-          "object": "LayoutSVGRect rect",
-          "rect": [16, 16, 18, 18],
-          "reason": "layoutObject insertion"
-        },
-        {
-          "object": "LayoutSVGRect rect",
-          "rect": [8, 8, 17, 17],
-          "reason": "layoutObject insertion"
-        },
-        {
-          "object": "LayoutSVGRect rect",
-          "rect": [8, 8, 17, 17],
-          "reason": "layoutObject insertion"
         }
       ]
     }
   ],
   "objectPaintInvalidations": [
     {
       "object": "LayoutSVGResourcePattern pattern id='fillPattern'",
       "reason": "layoutObject insertion"
     },
     {
@@ skipping 64 matching lines @@
       "object": "LayoutSVGInlineText #text",
       "reason": "layoutObject insertion"
     },
     {
       "object": "InlineTextBox 'Pattern on fill/stroke'",
       "reason": "layoutObject insertion"
     }
   ]
 }