Change SVG layout tree output to be more meaningful and consistent

third_party/WebKit/LayoutTests/platform/mac/svg/text/text-selection-tselect-01-b-expected.txt

 layer at (0,0) size 800x600
   LayoutView at (0,0) size 800x600
 layer at (0,0) size 800x600
   LayoutSVGRoot {svg} at (0,0) size 800x600
-    LayoutSVGContainer {g} at (0,0) size 800x600
-      LayoutSVGText {text} at (10,5) size 302x19 contains 1 chunk(s)
-        LayoutSVGInlineText {#text} at (0,0) size 302x18
+    LayoutSVGContainer {g} at (1,1) size 478x358
+      LayoutSVGText {text} at (10,5.61) size 301.41x18 contains 1 chunk(s)
+        LayoutSVGInlineText {#text} at (10,5.61) size 301.41x18
           chunk 1 text run 1 at (10.00,20.00) startOffset 0 endOffset 46 width 301.42: "Test single line and multiline text selection."
-      LayoutSVGContainer {g} at (41,84) size 601x364
-        LayoutSVGText {text} at (25,50) size 255x19 contains 1 chunk(s)
-          LayoutSVGInlineText {#text} at (0,0) size 255x18
+      LayoutSVGContainer {g} at (25,50.61) size 360.09x218
+        LayoutSVGText {text} at (25,50.61) size 254.17x18 contains 1 chunk(s)
+          LayoutSVGInlineText {#text} at (25,50.61) size 254.17x18
             chunk 1 text run 1 at (25.00,65.00) startOffset 0 endOffset 37 width 254.18: "Here is a stand-alone 'text' element."
-        LayoutSVGText {text} at (25,75) size 297x19 contains 1 chunk(s)
-          LayoutSVGInlineText {#text} at (0,0) size 297x18
+        LayoutSVGText {text} at (25,75.61) size 296.84x18 contains 1 chunk(s)
+          LayoutSVGInlineText {#text} at (25,75.61) size 296.84x18
             chunk 1 text run 1 at (25.00,90.00) startOffset 0 endOffset 43 width 296.86: "Here is a second 'text' element just below."
-        LayoutSVGText {text} at (25,100) size 343x19 contains 1 chunk(s)
-          LayoutSVGInlineText {#text} at (0,0) size 343x18
+        LayoutSVGText {text} at (25,100.61) size 342.22x18 contains 1 chunk(s)
+          LayoutSVGInlineText {#text} at (25,100.61) size 342.22x18
             chunk 1 text run 1 at (25.00,115.00) startOffset 0 endOffset 48 width 342.22: "Because these are four separate 'text' elements,"
-        LayoutSVGText {text} at (25,125) size 324x19 contains 1 chunk(s)
-          LayoutSVGInlineText {#text} at (0,0) size 324x18
+        LayoutSVGText {text} at (25,125.61) size 323.66x18 contains 1 chunk(s)
+          LayoutSVGInlineText {#text} at (25,125.61) size 323.66x18
             chunk 1 text run 1 at (25.00,140.00) startOffset 0 endOffset 47 width 323.66: "text selection should not go across lines here."
-        LayoutSVGText {text} at (25,175) size 361x94 contains 1 chunk(s)
+        LayoutSVGText {text} at (25,175.61) size 360.09x93 contains 1 chunk(s)
           LayoutSVGTSpan {tspan} at (0,0) size 356x18
-            LayoutSVGInlineText {#text} at (0,0) size 356x18
+            LayoutSVGInlineText {#text} at (25,175.61) size 355.66x18
               chunk 1 text run 1 at (25.00,190.00) startOffset 0 endOffset 50 width 355.67: "However, these lines of text are achieved by using"
-          LayoutSVGInlineText {#text} at (355,0) size 5x18
+          LayoutSVGInlineText {#text} at (380.66,175.61) size 4.44x18
             chunk 1 text run 1 at (380.67,190.00) startOffset 0 endOffset 1 width 4.44: " "
           LayoutSVGTSpan {tspan} at (0,0) size 348x18
-            LayoutSVGInlineText {#text} at (0,25) size 348x18
+            LayoutSVGInlineText {#text} at (25,200.61) size 347.56x18
               chunk 1 text run 1 at (25.00,215.00) startOffset 0 endOffset 51 width 347.57: "one 'tspan' per line, all contained within the same"
-          LayoutSVGInlineText {#text} at (347,25) size 5x18
+          LayoutSVGInlineText {#text} at (372.56,200.61) size 4.44x18
             chunk 1 text run 1 at (372.57,215.00) startOffset 0 endOffset 1 width 4.44: " "
           LayoutSVGTSpan {tspan} at (0,0) size 343x18
-            LayoutSVGInlineText {#text} at (0,50) size 343x18
+            LayoutSVGInlineText {#text} at (25,225.61) size 342.22x18
               chunk 1 text run 1 at (25.00,240.00) startOffset 0 endOffset 51 width 342.23: "'text' element, so you should be able to select all"
-          LayoutSVGInlineText {#text} at (342,50) size 5x18
+          LayoutSVGInlineText {#text} at (367.22,225.61) size 4.44x18
             chunk 1 text run 1 at (367.23,240.00) startOffset 0 endOffset 1 width 4.44: " "
           LayoutSVGTSpan {tspan} at (0,0) size 193x18
-            LayoutSVGInlineText {#text} at (0,75) size 193x18
+            LayoutSVGInlineText {#text} at (25,250.61) size 192.03x18
               chunk 1 text run 1 at (25.00,265.00) startOffset 0 endOffset 28 width 192.04: "four lines at the same time."
           LayoutSVGInlineText {#text} at (0,0) size 0x0
-      LayoutSVGText {text} at (10,304) size 264x47 contains 1 chunk(s)
-        LayoutSVGInlineText {#text} at (0,0) size 264x47
+      LayoutSVGText {text} at (10,304) size 263.31x46.19 contains 1 chunk(s)
+        LayoutSVGInlineText {#text} at (10,304) size 263.31x46.19
           chunk 1 text run 1 at (10.00,340.00) startOffset 0 endOffset 16 width 263.31: "$Revision: 1.8 $"
-      LayoutSVGRect {rect} at (0,0) size 800x600 [stroke={[type=SOLID] [color=#000000]}] [x=1.00] [y=1.00] [width=478.00] [height=358.00]
+      LayoutSVGRect {rect} at (1,1) size 478x358 [stroke={[type=SOLID] [color=#000000]}] [x=1.00] [y=1.00] [width=478.00] [height=358.00]
 selection start: position 0 of child 0 {#text} of child 1 {text} of child 13 {g} of child 25 {svg} of document
 selection end:   position 16 of child 0 {#text} of child 5 {text} of child 13 {g} of child 25 {svg} of document