Change SVG layout tree output to be more meaningful and consistent

third_party/WebKit/LayoutTests/platform/mac/svg/filters/sourceAlpha-expected.txt

Index: third_party/WebKit/LayoutTests/platform/mac/svg/filters/sourceAlpha-expected.txt
diff --git a/third_party/WebKit/LayoutTests/platform/mac/svg/filters/sourceAlpha-expected.txt b/third_party/WebKit/LayoutTests/platform/mac/svg/filters/sourceAlpha-expected.txt
index 8b6016d15505dac608bb0bbd7a18f7bd75c99b25..e8ef3c8df2447d25541cfc07a2215ea385f49704 100644
--- a/third_party/WebKit/LayoutTests/platform/mac/svg/filters/sourceAlpha-expected.txt
+++ b/third_party/WebKit/LayoutTests/platform/mac/svg/filters/sourceAlpha-expected.txt
@@ -1,13 +1,13 @@
 layer at (0,0) size 800x600
   LayoutView at (0,0) size 800x600
 layer at (0,0) size 800x600
-  LayoutSVGRoot {svg} at (41,9) size 98x56
+  LayoutSVGRoot {svg} at (0,0) size 800x600
     LayoutSVGHiddenContainer {defs} at (0,0) size 0x0
       LayoutSVGResourceFilter {filter} [id="filter"] [filterUnits=objectBoundingBox] [primitiveUnits=userSpaceOnUse]
         [feOffset dx="0.00" dy="0.00"]
           [SourceAlpha]
-    LayoutSVGContainer {g} at (41,9) size 98x56
+    LayoutSVGContainer {g} at (50,14) size 80.02x46
       [filter="filter"] LayoutSVGResourceFilter {filter} at (42,9.40) size 96.02x55.20
-      LayoutSVGText {text} at (50,14) size 81x46 contains 1 chunk(s)
-        LayoutSVGInlineText {#text} at (0,0) size 81x46
+      LayoutSVGText {text} at (50,14) size 80.02x46 contains 1 chunk(s)
+        LayoutSVGInlineText {#text} at (50,14) size 80.02x46
           chunk 1 text run 1 at (50.00,50.00) startOffset 0 endOffset 3 width 80.02: "SVG"