Change SVG layout tree output to be more meaningful and consistent

third_party/WebKit/LayoutTests/svg/custom/grayscale-gradient-mask-2-expected.txt

Index: third_party/WebKit/LayoutTests/svg/custom/grayscale-gradient-mask-2-expected.txt
diff --git a/third_party/WebKit/LayoutTests/svg/custom/grayscale-gradient-mask-2-expected.txt b/third_party/WebKit/LayoutTests/svg/custom/grayscale-gradient-mask-2-expected.txt
index 68d9f3a5ac69eecf8bf63e8be9fcea0743a78b2d..3a993941601b21dcc64d89d7119593a63f2ba965 100644
--- a/third_party/WebKit/LayoutTests/svg/custom/grayscale-gradient-mask-2-expected.txt
+++ b/third_party/WebKit/LayoutTests/svg/custom/grayscale-gradient-mask-2-expected.txt
@@ -1,21 +1,21 @@
 layer at (0,0) size 800x600
   LayoutView at (0,0) size 800x600
 layer at (0,0) size 800x600
-  LayoutSVGRoot {svg} at (0,143) size 781x294
+  LayoutSVGRoot {svg} at (0,0) size 800x600
     LayoutSVGHiddenContainer {defs} at (0,0) size 0x0
       LayoutSVGResourceLinearGradient {linearGradient} [id="Gradient"] [gradientUnits=userSpaceOnUse] [start=(0,0)] [end=(800,0)]
         LayoutSVGGradientStop {stop} [offset=0.00] [color=#FFFFFF]
         LayoutSVGGradientStop {stop} [offset=1.00] [color=#000000]
     LayoutSVGResourceMasker {mask} [id="Mask1"] [maskUnits=userSpaceOnUse] [maskContentUnits=userSpaceOnUse]
-      LayoutSVGRect {rect} at (0,143) size 781x99 [fill={[type=LINEAR-GRADIENT] [id="Gradient"]}] [x=0.00] [y=0.00] [width=800.00] [height=100.00]
+      LayoutSVGRect {rect} at (0,0) size 800x100 [fill={[type=LINEAR-GRADIENT] [id="Gradient"]}] [x=0.00] [y=0.00] [width=800.00] [height=100.00]
     LayoutSVGResourceMasker {mask} [id="Mask2"] [maskUnits=userSpaceOnUse] [maskContentUnits=userSpaceOnUse]
-      LayoutSVGRect {rect} at (0,241) size 781x99 [fill={[type=LINEAR-GRADIENT] [id="Gradient"]}] [x=0.00] [y=100.00] [width=800.00] [height=100.00]
+      LayoutSVGRect {rect} at (0,100) size 800x100 [fill={[type=LINEAR-GRADIENT] [id="Gradient"]}] [x=0.00] [y=100.00] [width=800.00] [height=100.00]
     LayoutSVGResourceMasker {mask} [id="Mask3"] [maskUnits=userSpaceOnUse] [maskContentUnits=userSpaceOnUse]
-      LayoutSVGRect {rect} at (0,339) size 781x98 [fill={[type=LINEAR-GRADIENT] [id="Gradient"]}] [x=0.00] [y=200.00] [width=800.00] [height=100.00]
-    LayoutSVGRect {rect} at (0,143) size 781x294 [fill={[type=SOLID] [color=#FF8080]}] [x=0.00] [y=0.00] [width=800.00] [height=300.00]
-    LayoutSVGRect {rect} at (0,143) size 781x99 [fill={[type=SOLID] [color=#0000FF]}] [x=0.00] [y=0.00] [width=800.00] [height=100.00]
+      LayoutSVGRect {rect} at (0,200) size 800x100 [fill={[type=LINEAR-GRADIENT] [id="Gradient"]}] [x=0.00] [y=200.00] [width=800.00] [height=100.00]
+    LayoutSVGRect {rect} at (0,0) size 800x300 [fill={[type=SOLID] [color=#FF8080]}] [x=0.00] [y=0.00] [width=800.00] [height=300.00]
+    LayoutSVGRect {rect} at (0,0) size 800x100 [fill={[type=SOLID] [color=#0000FF]}] [x=0.00] [y=0.00] [width=800.00] [height=100.00]
       [masker="Mask1"] LayoutSVGResourceMasker {mask} at (0,0) size 800x100
-    LayoutSVGRect {rect} at (0,241) size 781x99 [fill={[type=SOLID] [color=#0000FF]}] [x=0.00] [y=100.00] [width=800.00] [height=100.00]
+    LayoutSVGRect {rect} at (0,100) size 800x100 [fill={[type=SOLID] [color=#0000FF]}] [x=0.00] [y=100.00] [width=800.00] [height=100.00]
       [masker="Mask2"] LayoutSVGResourceMasker {mask} at (0,100) size 800x100
-    LayoutSVGRect {rect} at (0,339) size 781x98 [fill={[type=SOLID] [color=#0000FF]}] [x=0.00] [y=200.00] [width=800.00] [height=100.00]
+    LayoutSVGRect {rect} at (0,200) size 800x100 [fill={[type=SOLID] [color=#0000FF]}] [x=0.00] [y=200.00] [width=800.00] [height=100.00]
       [masker="Mask3"] LayoutSVGResourceMasker {mask} at (0,200) size 800x100