Change SVG layout tree output to be more meaningful and consistent

third_party/WebKit/LayoutTests/svg/filters/feMerge-expected.txt

Index: third_party/WebKit/LayoutTests/svg/filters/feMerge-expected.txt
diff --git a/third_party/WebKit/LayoutTests/svg/filters/feMerge-expected.txt b/third_party/WebKit/LayoutTests/svg/filters/feMerge-expected.txt
index f52ee59e78dd2887ed2aefb46057e4882c6f3397..f0ebf46ff4babd005b06f7e11a643036d18bfc26 100644
--- a/third_party/WebKit/LayoutTests/svg/filters/feMerge-expected.txt
+++ b/third_party/WebKit/LayoutTests/svg/filters/feMerge-expected.txt
@@ -1,7 +1,7 @@
 layer at (0,0) size 800x600
   LayoutView at (0,0) size 800x600
 layer at (0,0) size 800x600
-  LayoutSVGRoot {svg} at (0,0) size 575x175
+  LayoutSVGRoot {svg} at (0,0) size 800x600
     LayoutSVGHiddenContainer {defs} at (0,0) size 0x0
       LayoutSVGResourceFilter {filter} [id="filter_1"] [filterUnits=objectBoundingBox] [primitiveUnits=objectBoundingBox]
         [feMerge mergeNodes="2"]
@@ -15,9 +15,9 @@ layer at (0,0) size 800x600
         [feMerge mergeNodes="2"]
           [feFlood flood-color="#FF0000" flood-opacity="1.00"]
           [feFlood flood-color="#0000FF" flood-opacity="1.00"]
-    LayoutSVGRect {rect} at (0,0) size 175x175 [fill={[type=SOLID] [color=#000000]}] [x=10.00] [y=10.00] [width=150.00] [height=150.00]
+    LayoutSVGRect {rect} at (10,10) size 150x150 [fill={[type=SOLID] [color=#000000]}] [x=10.00] [y=10.00] [width=150.00] [height=150.00]
       [filter="filter_1"] LayoutSVGResourceFilter {filter} at (-5,-5) size 180x180
-    LayoutSVGRect {rect} at (195,0) size 180x175 [fill={[type=SOLID] [color=#000000]}] [x=210.00] [y=10.00] [width=150.00] [height=150.00]
+    LayoutSVGRect {rect} at (210,10) size 150x150 [fill={[type=SOLID] [color=#000000]}] [x=210.00] [y=10.00] [width=150.00] [height=150.00]
       [filter="filter_2"] LayoutSVGResourceFilter {filter} at (195,-5) size 180x180
-    LayoutSVGRect {rect} at (395,0) size 180x175 [fill={[type=SOLID] [color=#000000]}] [x=410.00] [y=10.00] [width=150.00] [height=150.00]
+    LayoutSVGRect {rect} at (410,10) size 150x150 [fill={[type=SOLID] [color=#000000]}] [x=410.00] [y=10.00] [width=150.00] [height=150.00]
       [filter="filter_3"] LayoutSVGResourceFilter {filter} at (395,-5) size 180x180