Fix getBBox() returning (0,0) bug when width or height is zero

LayoutTests/platform/linux/svg/custom/use-on-use-expected.txt

Index: LayoutTests/platform/linux/svg/custom/use-on-use-expected.txt
diff --git a/LayoutTests/platform/win/svg/custom/use-on-use-expected.txt b/LayoutTests/platform/linux/svg/custom/use-on-use-expected.txt
similarity index 68%
copy from LayoutTests/platform/win/svg/custom/use-on-use-expected.txt
copy to LayoutTests/platform/linux/svg/custom/use-on-use-expected.txt
index 9ccd2f78ab2aca89d49c4d002ed08c92107079ac..99e639a02e3bc37272e871f1d08c8541662f8b95 100644
--- a/LayoutTests/platform/win/svg/custom/use-on-use-expected.txt
+++ b/LayoutTests/platform/linux/svg/custom/use-on-use-expected.txt
@@ -1,24 +1,24 @@
 layer at (0,0) size 800x600
   RenderView at (0,0) size 800x600
 layer at (0,0) size 800x600
-  RenderSVGRoot {svg} at (20,40) size 481x88
+  RenderSVGRoot {svg} at (20,39) size 481x89
     RenderSVGHiddenContainer {defs} at (0,0) size 0x0
-      RenderSVGContainer {g} at (0,0) size 125x30
+      RenderSVGContainer {g} at (0,0) size 125x31
         RenderSVGRect {rect} at (0,0) size 125x25 [stroke={[type=SOLID] [color=#000080] [stroke width=5.00]}] [fill={[type=SOLID] [color=#FF0000]}] [x=0.00] [y=0.00] [width=60.00] [height=10.00]
-        RenderSVGEllipse {circle} at (40,0) size 40x30 [opacity=0.50] [fill={[type=SOLID] [color=#008000]}] [cx=30.00] [cy=5.00] [r=10.00]
-      RenderSVGContainer {use} at (0,0) size 125x30
-        RenderSVGContainer {g} at (0,0) size 125x30
+        RenderSVGEllipse {circle} at (39,0) size 42x31 [opacity=0.50] [fill={[type=SOLID] [color=#008000]}] [cx=30.00] [cy=5.00] [r=10.00]
+      RenderSVGContainer {use} at (0,0) size 125x31
+        RenderSVGContainer {g} at (0,0) size 125x31
           RenderSVGRect {rect} at (0,0) size 125x25 [stroke={[type=SOLID] [color=#000080] [stroke width=5.00]}] [fill={[type=SOLID] [color=#FF0000]}] [x=0.00] [y=0.00] [width=60.00] [height=10.00]
-          RenderSVGEllipse {circle} at (40,0) size 40x30 [opacity=0.50] [fill={[type=SOLID] [color=#008000]}] [cx=30.00] [cy=5.00] [r=10.00]
-    RenderSVGContainer {g} at (245,40) size 130x40 [transform={m=((1.00,0.00)(0.00,1.00)) t=(125.00,25.00)}]
-      RenderSVGContainer {g} at (245,40) size 130x40
+          RenderSVGEllipse {circle} at (39,0) size 42x31 [opacity=0.50] [fill={[type=SOLID] [color=#008000]}] [cx=30.00] [cy=5.00] [r=10.00]
+    RenderSVGContainer {g} at (245,39) size 130x42 [transform={m=((1.00,0.00)(0.00,1.00)) t=(125.00,25.00)}]
+      RenderSVGContainer {g} at (245,39) size 130x42
         RenderSVGRect {rect} at (245,45) size 130x30 [stroke={[type=SOLID] [color=#000080] [stroke width=5.00]}] [fill={[type=SOLID] [color=#FF0000]}] [x=0.00] [y=0.00] [width=60.00] [height=10.00]
-        RenderSVGEllipse {circle} at (290,40) size 40x40 [opacity=0.50] [fill={[type=SOLID] [color=#008000]}] [cx=30.00] [cy=5.00] [r=10.00]
+        RenderSVGEllipse {circle} at (289,39) size 42x42 [opacity=0.50] [fill={[type=SOLID] [color=#008000]}] [cx=30.00] [cy=5.00] [r=10.00]
     RenderSVGText {text} at (10,46) size 241x18 contains 1 chunk(s)
       RenderSVGInlineText {#text} at (0,0) size 241x18
         chunk 1 text run 1 at (10.00,60.00) startOffset 0 endOffset 38 width 240.50: "The two objects should look identical."
-    RenderSVGContainer {use} at (45,40) size 130x40 [transform={m=((1.00,0.00)(0.00,1.00)) t=(25.00,25.00)}]
-      RenderSVGContainer {g} at (45,40) size 130x40
-        RenderSVGContainer {g} at (45,40) size 130x40
+    RenderSVGContainer {use} at (45,39) size 130x42 [transform={m=((1.00,0.00)(0.00,1.00)) t=(25.00,25.00)}]
+      RenderSVGContainer {g} at (45,39) size 130x42
+        RenderSVGContainer {g} at (45,39) size 130x42
           RenderSVGRect {rect} at (45,45) size 130x30 [stroke={[type=SOLID] [color=#000080] [stroke width=5.00]}] [fill={[type=SOLID] [color=#FF0000]}] [x=0.00] [y=0.00] [width=60.00] [height=10.00]
-          RenderSVGEllipse {circle} at (90,40) size 40x40 [opacity=0.50] [fill={[type=SOLID] [color=#008000]}] [cx=30.00] [cy=5.00] [r=10.00]
+          RenderSVGEllipse {circle} at (89,39) size 42x42 [opacity=0.50] [fill={[type=SOLID] [color=#008000]}] [cx=30.00] [cy=5.00] [r=10.00]