Change SVG layout tree output to be more meaningful and consistent

third_party/WebKit/LayoutTests/platform/mac/svg/text/bbox-with-glyph-overflow-expected.txt

 layer at (0,0) size 800x600
   LayoutView at (0,0) size 800x600
 layer at (0,0) size 800x538
   LayoutBlockFlow {HTML} at (0,0) size 800x538
     LayoutBlockFlow {BODY} at (8,8) size 784x522
       LayoutText {#text} at (0,0) size 272x18
         text run at (0,0) width 272: "No glyphs should extend outside the rects."
       LayoutBR {BR} at (271,0) size 1x18
-      LayoutSVGRoot {svg} at (46,29) size 299x496
-        LayoutSVGText {text} at (42,4) size 127x59 contains 1 chunk(s)
-          LayoutSVGInlineText {#text} at (0,0) size 126x59
+      LayoutSVGRoot {svg} at (0,18) size 700x500
+        LayoutSVGText {text} at (42.55,4) size 125.84x59 contains 1 chunk(s)
+          LayoutSVGInlineText {#text} at (42.55,4) size 125.84x59
             chunk 1 text run 1 at (50.00,50.00) startOffset 0 endOffset 8 width 111.13: "ffffffff"
-        LayoutSVGText {text} at (42,104) size 182x59 contains 1 chunk(s)
-          LayoutSVGInlineText {#text} at (0,0) size 99x59
+        LayoutSVGText {text} at (42.55,104) size 181.41x59 contains 1 chunk(s)
+          LayoutSVGInlineText {#text} at (42.55,104) size 98.06x59
             chunk 1 text run 1 at (50.00,150.00) startOffset 0 endOffset 6 width 83.35: "ffffff"
           LayoutSVGTSpan {tspan} at (0,0) size 99x59
-            LayoutSVGInlineText {#text} at (83,0) size 99x59
+            LayoutSVGInlineText {#text} at (125.89,104) size 98.06x59
               chunk 1 text run 1 at (133.35,150.00) startOffset 0 endOffset 6 width 83.35: "ffffff"
-        LayoutSVGText {text} at (45,178) size 200x92 contains 1 chunk(s)
+        LayoutSVGText {text} at (45.53,178) size 199.47x92 contains 1 chunk(s)
           LayoutSVGTSpan {tspan} at (0,0) size 59x36
-            LayoutSVGInlineText {#text} at (0,44) size 59x36
+            LayoutSVGInlineText {#text} at (45.53,222) size 58.83x36
               chunk 1 text run 1 at (50.00,250.00) startOffset 0 endOffset 6 width 50.01: "ffffff"
           LayoutSVGTSpan {tspan} at (0,0) size 158x92
-            LayoutSVGInlineText {#text} at (42,0) size 157x92
+            LayoutSVGInlineText {#text} at (88.09,178) size 156.91x92
               chunk 1 text run 1 at (100.01,250.00) startOffset 0 endOffset 6 width 133.36: "ffffff"
-        LayoutSVGText {text} at (38,299) size 298x102 contains 1 chunk(s)
-          LayoutSVGInlineText {#text} at (0,0) size 298x101
+        LayoutSVGText {text} at (38.55,299.53) size 297.11x100.92 contains 1 chunk(s)
+          LayoutSVGInlineText {#text} at (38.55,299.53) size 297.11x100.92
             chunk 1 text run 1 at (50.00,350.00) startOffset 0 endOffset 1 width 13.89: "f"
             chunk 1 text run 2 at (63.89,350.00) startOffset 1 endOffset 2 width 13.89: "f"
             chunk 1 text run 3 at (77.78,350.00) startOffset 2 endOffset 3 width 13.89: "f"
             chunk 1 text run 4 at (91.67,350.00) startOffset 3 endOffset 4 width 13.89: "f"
             chunk 1 text run 5 at (105.57,350.00) startOffset 4 endOffset 5 width 13.89: "f"
             chunk 1 text run 6 at (119.46,350.00) startOffset 5 endOffset 6 width 13.89: "f"
             chunk 1 text run 7 at (133.35,350.00) startOffset 6 endOffset 7 width 13.89: "f"
             chunk 1 text run 8 at (147.24,350.00) startOffset 7 endOffset 8 width 13.89: "f"
             chunk 1 text run 9 at (161.13,350.00) startOffset 8 endOffset 9 width 13.89: "f"
             chunk 1 text run 10 at (175.02,350.00) startOffset 9 endOffset 10 width 13.89: "f"
             chunk 1 text run 11 at (188.92,350.00) startOffset 10 endOffset 11 width 13.89: "f"
             chunk 1 text run 12 at (202.81,350.00) startOffset 11 endOffset 12 width 13.89: "f"
             chunk 1 text run 13 at (216.70,350.00) startOffset 12 endOffset 13 width 13.89: "f"
             chunk 1 text run 14 at (230.59,350.00) startOffset 13 endOffset 14 width 13.89: "f"
             chunk 1 text run 15 at (244.48,350.00) startOffset 14 endOffset 15 width 13.89: "f"
             chunk 1 text run 16 at (258.37,350.00) startOffset 15 endOffset 16 width 13.89: "f"
             chunk 1 text run 17 at (272.27,350.00) startOffset 16 endOffset 17 width 13.89: "f"
             chunk 1 text run 18 at (286.16,350.00) startOffset 17 endOffset 18 width 13.89: "f"
             chunk 1 text run 19 at (300.05,350.00) startOffset 18 endOffset 19 width 13.89: "f"
-        LayoutSVGText {text} at (49,419) size 106x79 contains 1 chunk(s)
-          LayoutSVGInlineText {#text} at (0,0) size 106x79
+        LayoutSVGText {text} at (49.16,419) size 105.80x79 contains 1 chunk(s)
+          LayoutSVGInlineText {#text} at (49.16,419) size 105.80x79
             chunk 1 text run 1 at (50.00,475.00) startOffset 0 endOffset 5 width 96.53: "'faQ'"
-        LayoutSVGRect {rect} at (50,29) size 127x61 [stroke={[type=SOLID] [color=#008000]}] [fill={[type=SOLID] [color=#00000000]}] [x=42.55] [y=4.00] [width=125.84] [height=59.00]
-        LayoutSVGRect {rect} at (50,129) size 183x61 [stroke={[type=SOLID] [color=#008000]}] [fill={[type=SOLID] [color=#00000000]}] [x=42.55] [y=104.00] [width=181.41] [height=59.00]
-        LayoutSVGRect {rect} at (53,203) size 201x94 [stroke={[type=SOLID] [color=#008000]}] [fill={[type=SOLID] [color=#00000000]}] [x=45.53] [y=178.00] [width=199.47] [height=92.00]
-        LayoutSVGRect {rect} at (46,325) size 299x102 [stroke={[type=SOLID] [color=#008000]}] [fill={[type=SOLID] [color=#00000000]}] [x=38.55] [y=299.53] [width=297.11] [height=100.92]
-        LayoutSVGRect {rect} at (56,444) size 108x81 [stroke={[type=SOLID] [color=#008000]}] [fill={[type=SOLID] [color=#00000000]}] [x=49.16] [y=419.00] [width=105.80] [height=79.00]
+        LayoutSVGRect {rect} at (42.55,4) size 125.84x59 [stroke={[type=SOLID] [color=#008000]}] [fill={[type=SOLID] [color=#00000000]}] [x=42.55] [y=4.00] [width=125.84] [height=59.00]
+        LayoutSVGRect {rect} at (42.55,104) size 181.41x59 [stroke={[type=SOLID] [color=#008000]}] [fill={[type=SOLID] [color=#00000000]}] [x=42.55] [y=104.00] [width=181.41] [height=59.00]
+        LayoutSVGRect {rect} at (45.53,178) size 199.47x92 [stroke={[type=SOLID] [color=#008000]}] [fill={[type=SOLID] [color=#00000000]}] [x=45.53] [y=178.00] [width=199.47] [height=92.00]
+        LayoutSVGRect {rect} at (38.55,299.53) size 297.11x100.92 [stroke={[type=SOLID] [color=#008000]}] [fill={[type=SOLID] [color=#00000000]}] [x=38.55] [y=299.53] [width=297.11] [height=100.92]
+        LayoutSVGRect {rect} at (49.16,419) size 105.80x79 [stroke={[type=SOLID] [color=#008000]}] [fill={[type=SOLID] [color=#00000000]}] [x=49.16] [y=419.00] [width=105.80] [height=79.00]
       LayoutText {#text} at (0,0) size 0x0
       LayoutText {#text} at (0,0) size 0x0