Put SVGResourceContainer subtypes into their own property trees.

third_party/WebKit/LayoutTests/platform/linux/paint/invalidation/svg/tabgroup-expected.txt

 {
   "layers": [
     {
       "name": "LayoutView #document",
       "bounds": [800, 600],
       "contentsOpaque": true,
       "drawsContent": true,
       "paintInvalidations": [
         {
           "object": "LayoutSVGPath path",
@@ skipping 39 matching lines @@
           "object": "LayoutSVGPath path",
           "rect": [263, 279, 301, 301],
           "reason": "layoutObject insertion"
         },
         {
           "object": "LayoutSVGContainer g id='tabgroupRectRound'",
           "rect": [263, 279, 301, 300],
           "reason": "became visible"
         },
         {
+          "object": "LayoutSVGRect rect",
+          "rect": [30, 188, 240, 12],
+          "reason": "layoutObject removal"
+        },
+        {
           "object": "LayoutSVGPath path",
           "rect": [506, 233, 238, 159],
           "reason": "layoutObject insertion"
         },
         {
           "object": "LayoutSVGPath path",
           "rect": [506, 233, 238, 159],
           "reason": "layoutObject insertion"
         },
         {
@@ skipping 31 matching lines @@
           "rect": [507, 233, 236, 159],
           "reason": "became visible"
         },
         {
           "object": "LayoutSVGContainer g id='tabgroupTriangle'",
           "rect": [7, 257, 236, 158],
           "reason": "became visible"
         },
         {
           "object": "LayoutSVGRect rect",
-          "rect": [31, 404, 188, 10],
-          "reason": "layoutObject insertion"
-        },
-        {
-          "object": "LayoutSVGRect rect",
-          "rect": [23, 146, 188, 10],
+          "rect": [39, 189, 222, 122],
           "reason": "layoutObject removal"
         },
         {
           "object": "LayoutSVGRect rect",
-          "rect": [30, 147, 175, 97],
+          "rect": [40, 188, 220, 122],
           "reason": "layoutObject removal"
         },
         {
-          "object": "LayoutSVGRect rect",
-          "rect": [38, 405, 174, 96],
-          "reason": "layoutObject insertion"
-        },
-        {
-          "object": "LayoutSVGRect rect",
-          "rect": [39, 404, 172, 96],
-          "reason": "layoutObject insertion"
-        },
-        {
-          "object": "LayoutSVGRect rect",
-          "rect": [31, 146, 172, 96],
+          "object": "LayoutSVGInlineText #text",
+          "rect": [10, 43, 192, 31],
           "reason": "layoutObject removal"
         },
         {
+          "object": "LayoutSVGInlineText #text",
+          "rect": [10, 43, 192, 31],
+          "reason": "layoutObject removal"
+        },
+        {
+          "object": "LayoutSVGTSpan tspan",
+          "rect": [10, 43, 192, 31],
+          "reason": "layoutObject removal"
+        },
+        {
+          "object": "LayoutSVGText text",
+          "rect": [10, 43, 192, 31],
+          "reason": "layoutObject removal"
+        },
+        {
           "object": "LayoutSVGPath path",
           "rect": [38, 6, 159, 238],
           "reason": "layoutObject insertion"
         },
         {
           "object": "LayoutSVGPath path",
           "rect": [38, 6, 159, 238],
           "reason": "layoutObject insertion"
         },
         {
           "object": "LayoutSVGPath path",
           "rect": [38, 6, 159, 238],
           "reason": "layoutObject insertion"
         },
         {
           "object": "LayoutSVGPath path",
           "rect": [38, 6, 159, 238],
           "reason": "layoutObject insertion"
         },
         {
           "object": "LayoutSVGContainer g id='tabgroupRect'",
           "rect": [38, 7, 158, 236],
           "reason": "became visible"
         },
         {
-          "object": "LayoutSVGText text",
-          "rect": [15, 291, 151, 25],
-          "reason": "layoutObject insertion"
-        },
-        {
-          "object": "LayoutSVGInlineText #text",
-          "rect": [7, 33, 151, 25],
-          "reason": "layoutObject removal"
-        },
-        {
-          "object": "LayoutSVGInlineText #text",
-          "rect": [7, 33, 151, 25],
-          "reason": "layoutObject removal"
-        },
-        {
-          "object": "LayoutSVGTSpan tspan",
-          "rect": [7, 33, 151, 25],
-          "reason": "layoutObject removal"
-        },
-        {
-          "object": "LayoutSVGText text",
-          "rect": [7, 33, 151, 25],
-          "reason": "layoutObject removal"
-        },
-        {
           "object": "LayoutSVGPath path id='tabgroupTriangle__1'",
           "rect": [61, 256, 67, 31],
           "reason": "layoutObject insertion"
         },
         {
           "object": "LayoutSVGPath path id='tabgroupRectTriangle__0'",
           "rect": [506, 233, 67, 18],
           "reason": "layoutObject insertion"
         },
         {
@@ skipping 1447 matching lines @@
       "object": "InlineTextBox 'Biography'",
       "reason": "layoutObject insertion"
     },
     {
       "object": "LayoutSVGContainer g id='tabgroupRectRound__0_content'",
       "reason": "layoutObject insertion"
     }
   ]
 }