Change SVG layout tree output to be more meaningful and consistent

third_party/WebKit/LayoutTests/platform/mac/svg/custom/marker-overflow-clip-expected.txt

Index: third_party/WebKit/LayoutTests/platform/mac/svg/custom/marker-overflow-clip-expected.txt
diff --git a/third_party/WebKit/LayoutTests/platform/mac/svg/custom/marker-overflow-clip-expected.txt b/third_party/WebKit/LayoutTests/platform/mac/svg/custom/marker-overflow-clip-expected.txt
new file mode 100644
index 0000000000000000000000000000000000000000..b592ea6a3d88a771fdf90d6e82d1555e420dbf51
--- /dev/null
+++ b/third_party/WebKit/LayoutTests/platform/mac/svg/custom/marker-overflow-clip-expected.txt
@@ -0,0 +1,12 @@
+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
+    LayoutSVGResourceMarker {marker} [id="marker"] [markerUnits=strokeWidth] [ref at (50,50)] [angle=auto]
+      LayoutSVGRect {rect} at (-50,-50) size 200x200 [fill={[type=SOLID] [color=#FF0000]}] [x=-50.00] [y=-50.00] [width=200.00] [height=200.00]
+      LayoutSVGRect {rect} at (0,0) size 100x100 [fill={[type=SOLID] [color=#008000]}] [x=0.00] [y=0.00] [width=100.00] [height=100.00]
+    LayoutSVGRect {rect} at (0,0) size 25x25 [fill={[type=SOLID] [color=#000000]}] [x=0.00] [y=0.00] [width=25.00] [height=25.00]
+    LayoutSVGPath {path} at (100,100) size 0x0 [start marker=marker] [data="M 100 100 L 100 100"]
+    LayoutSVGText {text} at (30,6) size 301.23x18 contains 1 chunk(s)
+      LayoutSVGInlineText {#text} at (30,6) size 301.23x18
+        chunk 1 text run 1 at (30.00,20.00) startOffset 0 endOffset 45 width 301.23: "There should be a 150x150 green rect at 25x25"