Change SVG layout tree output to be more meaningful and consistent

third_party/WebKit/LayoutTests/platform/mac/svg/text/small-fonts-2-expected.txt

 layer at (0,0) size 800x600
   LayoutView at (0,0) size 800x600
 layer at (0,0) size 800x600
-  LayoutSVGRoot {svg} at (160,0) size 477x530
-    LayoutSVGContainer {g} at (160,0) size 281x75 [transform={m=((0.10,0.00)(0.00,0.10)) t=(10.00,10.00)}]
-      LayoutSVGText {text} at (0,-109) size 468x134 contains 1 chunk(s)
-        LayoutSVGInlineText {#text} at (0,0) size 468x134
+  LayoutSVGRoot {svg} at (0,0) size 800x600
+    LayoutSVGContainer {g} at (0,-108.33) size 467.05x133.33 [transform={m=((0.10,0.00)(0.00,0.10)) t=(10.00,10.00)}]
+      LayoutSVGText {text} at (0,-108.33) size 467.05x133.33 contains 1 chunk(s)
+        LayoutSVGInlineText {#text} at (0,-108.33) size 467.05x133.33
           chunk 1 text run 1 at (0.00,0.00) startOffset 0 endOffset 9 width 467.05: "0,1,2,3,4"
-    LayoutSVGContainer {g} at (160,85) size 281x80 [transform={m=((1.00,0.00)(0.00,1.00)) t=(10.00,25.00)}]
-      LayoutSVGText {text} at (0,-11) size 47x14 contains 1 chunk(s)
-        LayoutSVGInlineText {#text} at (0,0) size 47x14
+    LayoutSVGContainer {g} at (0,-10.83) size 46.70x13.33 [transform={m=((1.00,0.00)(0.00,1.00)) t=(10.00,25.00)}]
+      LayoutSVGText {text} at (0,-10.83) size 46.70x13.33 contains 1 chunk(s)
+        LayoutSVGInlineText {#text} at (0,-10.83) size 46.70x13.33
           chunk 1 text run 1 at (0.00,0.00) startOffset 0 endOffset 9 width 46.71: "0,1,2,3,4"
-    LayoutSVGContainer {g} at (160,175) size 281x81 [transform={m=((12.00,0.00)(0.00,12.00)) t=(10.00,40.00)}]
-      LayoutSVGText {text} at (0,-1) size 4x2 contains 1 chunk(s)
-        LayoutSVGInlineText {#text} at (0,0) size 4x2
+    LayoutSVGContainer {g} at (0,-0.89) size 3.89x1.11 [transform={m=((12.00,0.00)(0.00,12.00)) t=(10.00,40.00)}]
+      LayoutSVGText {text} at (0,-0.89) size 3.89x1.11 contains 1 chunk(s)
+        LayoutSVGInlineText {#text} at (0,-0.89) size 3.89x1.11
           chunk 1 text run 1 at (0.00,0.00) startOffset 0 endOffset 9 width 3.89: "0,1,2,3,4"
-    LayoutSVGContainer {g} at (160,267) size 279x79 [transform={m=((24.00,0.00)(0.00,24.00)) t=(10.00,55.00)}]
-      LayoutSVGText {text} at (0,-1) size 2x2 contains 1 chunk(s)
-        LayoutSVGInlineText {#text} at (0,0) size 2x1
+    LayoutSVGContainer {g} at (0,-0.44) size 1.94x0.55 [transform={m=((24.00,0.00)(0.00,24.00)) t=(10.00,55.00)}]
+      LayoutSVGText {text} at (0,-0.44) size 1.94x0.55 contains 1 chunk(s)
+        LayoutSVGInlineText {#text} at (0,-0.44) size 1.94x0.55
           chunk 1 text run 1 at (0.00,0.00) startOffset 0 endOffset 9 width 1.95: "0,1,2,3,4"
-    LayoutSVGContainer {g} at (160,376) size 477x154 [transform={m=((0.30,0.00)(0.00,0.30)) t=(10.00,65.00)}]
-      LayoutSVGText {text} at (0,-8) size 265x86 contains 1 chunk(s)
+    LayoutSVGContainer {g} at (0,-7.77) size 264.63x85 [transform={m=((0.30,0.00)(0.00,0.30)) t=(10.00,65.00)}]
+      LayoutSVGText {text} at (0,-7.77) size 264.63x85 contains 1 chunk(s)
         LayoutSVGTSpan {tspan} at (0,0) size 217x10
-          LayoutSVGInlineText {#text} at (0,0) size 217x10
+          LayoutSVGInlineText {#text} at (0,-7.77) size 216.03x10
             chunk 1 text run 1 at (0.00,0.00) startOffset 0 endOffset 40 width 216.03: "For this test case to be successful, all"
-        LayoutSVGInlineText {#text} at (216,0) size 6x10
+        LayoutSVGInlineText {#text} at (216.03,-7.77) size 5.39x10
           chunk 1 text run 1 at (216.03,0.00) startOffset 0 endOffset 1 width 5.40: " "
         LayoutSVGTSpan {tspan} at (0,0) size 238x10
-          LayoutSVGInlineText {#text} at (0,15) size 238x10
+          LayoutSVGInlineText {#text} at (0,7.23) size 237.63x10
             chunk 1 text run 1 at (0.00,15.00) startOffset 0 endOffset 44 width 237.64: "lines of text must look the same. In Safari "
         LayoutSVGInlineText {#text} at (0,0) size 0x0
         LayoutSVGTSpan {tspan} at (0,0) size 254x10
-          LayoutSVGInlineText {#text} at (0,30) size 254x10
+          LayoutSVGInlineText {#text} at (0,22.23) size 253.83x10
             chunk 1 text run 1 at (0.00,30.00) startOffset 0 endOffset 47 width 253.84: "Beta 3, a text with a font size of 1 or smaller"
-        LayoutSVGInlineText {#text} at (253,30) size 6x10
+        LayoutSVGInlineText {#text} at (253.83,22.23) size 5.39x10
           chunk 1 text run 1 at (253.84,30.00) startOffset 0 endOffset 1 width 5.40: " "
         LayoutSVGTSpan {tspan} at (0,0) size 260x10
-          LayoutSVGInlineText {#text} at (0,45) size 260x10
+          LayoutSVGInlineText {#text} at (0,37.23) size 259.23x10
             chunk 1 text run 1 at (0.00,45.00) startOffset 0 endOffset 48 width 259.24: "is not painted correctly, even if the coordinate"
-        LayoutSVGInlineText {#text} at (259,45) size 6x10
+        LayoutSVGInlineText {#text} at (259.23,37.23) size 5.39x10
           chunk 1 text run 1 at (259.24,45.00) startOffset 0 endOffset 1 width 5.40: " "
         LayoutSVGTSpan {tspan} at (0,0) size 190x10
-          LayoutSVGInlineText {#text} at (0,60) size 190x10
+          LayoutSVGInlineText {#text} at (0,52.23) size 189.02x10
             chunk 1 text run 1 at (0.00,60.00) startOffset 0 endOffset 35 width 189.03: "transformations make it equivalent."
-        LayoutSVGInlineText {#text} at (189,60) size 6x10
+        LayoutSVGInlineText {#text} at (189.02,52.23) size 5.39x10
           chunk 1 text run 1 at (189.03,60.00) startOffset 0 endOffset 1 width 5.40: " "
         LayoutSVGTSpan {tspan} at (0,0) size 49x10
-          LayoutSVGInlineText {#text} at (0,75) size 49x10
+          LayoutSVGInlineText {#text} at (0,67.23) size 48.59x10
             chunk 1 text run 1 at (0.00,75.00) startOffset 0 endOffset 9 width 48.61: "Bug 14242"
         LayoutSVGInlineText {#text} at (0,0) size 0x0