Change SVG layout tree output to be more meaningful and consistent

third_party/WebKit/LayoutTests/platform/linux/svg/custom/text-linking-expected.txt

 layer at (0,0) size 800x600
   LayoutView at (0,0) size 800x600
 layer at (0,0) size 800x600
-  LayoutSVGRoot {svg} at (97,35) size 124x219
-    LayoutSVGHiddenContainer {defs} at (0,0) size 0x0
+  LayoutSVGRoot {svg} at (0,0) size 800x600
+    LayoutSVGHiddenContainer {defs} at (0,-15) size 200x165
       LayoutSVGText {text} at (0,-15) size 159x19 contains 1 chunk(s)
-        LayoutSVGInlineText {#text} at (0,0) size 159x19
+        LayoutSVGInlineText {#text} at (0,-15) size 159x19
           chunk 1 text run 1 at (0.00,0.00) startOffset 0 endOffset 25 width 159.00: "Referenced character data"
       LayoutSVGPath {path} at (100,140) size 100x10 [fill={[type=SOLID] [color=#000000]}] [data="M 100 150 L 150 140 L 200 150"]
     LayoutSVGText {text} at (100,35) size 71x19 contains 1 chunk(s)
       LayoutSVGInline {a} at (0,0) size 71x19
         LayoutSVGTSpan {tspan} at (0,0) size 71x19
-          LayoutSVGInlineText {#text} at (0,0) size 71x19
+          LayoutSVGInlineText {#text} at (100,35) size 71x19
             chunk 1 text run 1 at (100.00,50.00) startOffset 0 endOffset 13 width 71.00: "tspan in link"
-    LayoutSVGText {text}
+    LayoutSVGText {text} at (0,0) size 0x0
       LayoutSVGInline {a} at (0,0) size 0x0
-    LayoutSVGText {text} at (97,124) size 93x30 contains 1 chunk(s)
+    LayoutSVGText {text} at (97.05,124.89) size 92.17x29.02 contains 1 chunk(s)
       LayoutSVGInline {a} at (0,0) size 93x30
         LayoutSVGTextPath {textPath} at (0,0) size 93x30
-          LayoutSVGInlineText {#text} at (0,0) size 93x30
+          LayoutSVGInlineText {#text} at (97.05,124.89) size 92.17x29.02
             chunk 1 text run 1 at (101.96,149.61) startOffset 0 endOffset 1 width 4.00: "t"
             chunk 1 text run 2 at (107.35,148.53) startOffset 1 endOffset 2 width 7.00: "e"
             chunk 1 text run 3 at (114.22,147.16) startOffset 2 endOffset 3 width 7.00: "x"
             chunk 1 text run 4 at (119.61,146.08) startOffset 3 endOffset 4 width 4.00: "t"
             chunk 1 text run 5 at (125.99,144.80) startOffset 4 endOffset 5 width 9.00: "P"
             chunk 1 text run 6 at (133.83,143.23) startOffset 5 endOffset 6 width 7.00: "a"
             chunk 1 text run 7 at (139.22,142.16) startOffset 6 endOffset 7 width 4.00: "t"
             chunk 1 text run 8 at (144.62,141.08) startOffset 7 endOffset 8 width 7.00: "h"
             chunk 1 text run 9 at (150.01,140.00) startOffset 8 endOffset 9 width 4.00: " "
             chunk 1 text run 10 at (153.44,140.69) startOffset 9 endOffset 10 width 3.00: "i"
             chunk 1 text run 11 at (158.34,141.67) startOffset 10 endOffset 11 width 7.00: "n"
             chunk 1 text run 12 at (163.74,142.75) startOffset 11 endOffset 12 width 4.00: " "
             chunk 1 text run 13 at (167.17,143.43) startOffset 12 endOffset 13 width 3.00: "l"
             chunk 1 text run 14 at (170.11,144.02) startOffset 13 endOffset 14 width 3.00: "i"
             chunk 1 text run 15 at (175.01,145.00) startOffset 14 endOffset 15 width 7.00: "n"
             chunk 1 text run 16 at (182.37,146.47) startOffset 15 endOffset 16 width 8.00: "k"
     LayoutSVGText {text} at (100,185) size 91x19 contains 1 chunk(s)
       LayoutSVGInline {a} at (0,0) size 91x19
-        LayoutSVGInlineText {#text} at (0,0) size 91x19
+        LayoutSVGInlineText {#text} at (100,185) size 91x19
           chunk 1 text run 1 at (100.00,200.00) startOffset 0 endOffset 15 width 91.00: "ltGlyph content"
     LayoutSVGText {text} at (100,235) size 121x19 contains 1 chunk(s)
       LayoutSVGTSpan {tspan} at (0,0) size 121x19
         LayoutSVGInline {a} at (0,0) size 121x19
           LayoutSVGTSpan {tspan} at (0,0) size 121x19
-            LayoutSVGInlineText {#text} at (0,0) size 121x19
+            LayoutSVGInlineText {#text} at (100,235) size 121x19
               chunk 1 text run 1 at (100.00,250.00) startOffset 0 endOffset 22 width 121.00: "tspan in link in tspan"
-    LayoutSVGText {text}
+    LayoutSVGText {text} at (0,0) size 0x0
       LayoutSVGInline {a} at (0,0) size 0x0