Change SVG layout tree output to be more meaningful and consistent

third_party/WebKit/LayoutTests/platform/mac/svg/custom/text-match-highlight-expected.txt

 layer at (0,0) size 800x600
   LayoutView at (0,0) size 800x600
 layer at (0,0) size 800x410
   LayoutBlockFlow {HTML} at (0,0) size 800x410
     LayoutBlockFlow {BODY} at (8,8) size 784x394
       LayoutText {#text} at (0,0) size 457x18
         text run at (0,0) width 457: "Test for crbug.com/56580: There should be 9 highlighted instances of \""
       LayoutInline {SPAN} at (0,0) size 45x18
         LayoutText {#text} at (456,0) size 45x18
           text run at (456,0) width 45: "findme"
@@ skipping 20 matching lines @@
         text run at (313,54) width 47: " lorum."
       LayoutBR {BR} at (359,54) size 1x18
       LayoutText {#text} at (0,72) size 53x18
         text run at (0,72) width 53: "longtext"
       LayoutInline {SPAN} at (0,0) size 45x18
         LayoutText {#text} at (52,72) size 45x18
           text run at (52,72) width 45: "findme"
       LayoutText {#text} at (96,72) size 45x18
         text run at (96,72) width 45: "noyou."
       LayoutBR {BR} at (140,72) size 1x18
-      LayoutSVGRoot {svg} at (17,133) size 234x161
-        LayoutSVGHiddenContainer {defs} at (0,0) size 0x0
-          LayoutSVGPath {path} at (108,98) size 350x300 [fill={[type=SOLID] [color=#000000]}] [data="M 100 200 C 200 100 300 0 400 100 C 500 200 600 300 700 200 C 800 100 900 100 900 100"]
-        LayoutSVGText {text} at (10,36) size 232x18 contains 1 chunk(s)
-          LayoutSVGInlineText {#text} at (0,0) size 232x18
+      LayoutSVGRoot {svg} at (0,90) size 450x300
+        LayoutSVGHiddenContainer {defs} at (100,0) size 800x300
+          LayoutSVGPath {path} at (100,0) size 800x300 [fill={[type=SOLID] [color=#000000]}] [data="M 100 200 C 200 100 300 0 400 100 C 500 200 600 300 700 200 C 800 100 900 100 900 100"]
+        LayoutSVGText {text} at (10,36) size 231.97x18 contains 1 chunk(s)
+          LayoutSVGInlineText {#text} at (10,36) size 231.97x18
             chunk 1 text run 1 at (10.00,50.00) startOffset 0 endOffset 36 width 231.98: "Can you findme in this stroked text?"
-        LayoutSVGText {text} at (10,90) size 139x12 contains 1 chunk(s)
-          LayoutSVGInlineText {#text} at (0,0) size 139x12
+        LayoutSVGText {text} at (10,90) size 138.02x12 contains 1 chunk(s)
+          LayoutSVGInlineText {#text} at (10,90) size 138.02x12
             chunk 1 text run 1 at (10.00,100.00) startOffset 0 endOffset 23 width 138.02: "Findme in a typewriter!"
-        LayoutSVGContainer {g} at (28,222) size 200x72 [transform={m=((0.30,0.00)(0.00,0.30)) t=(0.00,120.00)}]
-          LayoutSVGText {text} at (69,14) size 663x238 contains 1 chunk(s)
+        LayoutSVGContainer {g} at (69.42,14.72) size 661.92x237.08 [transform={m=((0.30,0.00)(0.00,0.30)) t=(0.00,120.00)}]
+          LayoutSVGText {text} at (69.42,14.72) size 661.92x237.08 contains 1 chunk(s)
             LayoutSVGTextPath {textPath} at (0,0) size 662x238
-              LayoutSVGInlineText {#text} at (0,0) size 662x238
+              LayoutSVGInlineText {#text} at (69.42,14.72) size 661.92x237.08
                 chunk 1 text run 1 at (108.68,191.32) startOffset 0 endOffset 1 width 24.43: "F"
                 chunk 1 text run 2 at (121.51,178.57) startOffset 1 endOffset 2 width 11.66: "i"
                 chunk 1 text run 3 at (135.21,165.11) startOffset 2 endOffset 3 width 26.89: "n"
                 chunk 1 text run 4 at (154.51,146.69) startOffset 3 endOffset 4 width 26.48: "d"
                 chunk 1 text run 5 at (179.77,123.99) startOffset 4 endOffset 5 width 41.34: "m"
                 chunk 1 text run 6 at (205.72,103.03) startOffset 5 endOffset 6 width 25.32: "e"
                 chunk 1 text run 7 at (222.14,91.35) startOffset 6 endOffset 7 width 14.94: " "
                 chunk 1 text run 8 at (239.46,80.63) startOffset 7 endOffset 8 width 25.79: "o"
                 chunk 1 text run 9 at (263.08,69.05) startOffset 8 endOffset 9 width 26.89: "n"
                 chunk 1 text run 10 at (282.89,62.42) startOffset 9 endOffset 10 width 14.94: " "
@@ skipping 15 matching lines @@
                 chunk 1 text run 26 at (569.22,233.33) startOffset 25 endOffset 26 width 14.94: " "
                 chunk 1 text run 27 at (583.56,237.75) startOffset 26 endOffset 27 width 14.94: "f"
                 chunk 1 text run 28 at (596.55,240.30) startOffset 27 endOffset 28 width 11.66: "i"
                 chunk 1 text run 29 at (615.78,241.36) startOffset 28 endOffset 29 width 26.89: "n"
                 chunk 1 text run 30 at (642.02,237.01) startOffset 29 endOffset 30 width 26.48: "d"
                 chunk 1 text run 31 at (672.58,222.56) startOffset 30 endOffset 31 width 41.34: "m"
                 chunk 1 text run 32 at (698.38,201.60) startOffset 31 endOffset 32 width 25.32: "e"
                 chunk 1 text run 33 at (716.06,184.77) startOffset 32 endOffset 33 width 23.18: "?"
             LayoutSVGInlineText {#text} at (0,0) size 0x0
       LayoutText {#text} at (0,0) size 0x0