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

LayoutTests/platform/linux/svg/clip-path/clip-path-clipped-evenodd-twice-expected.txt

Index: LayoutTests/platform/linux/svg/clip-path/clip-path-clipped-evenodd-twice-expected.txt
diff --git a/LayoutTests/svg/clip-path/clip-path-clipped-evenodd-twice-expected.txt b/LayoutTests/platform/linux/svg/clip-path/clip-path-clipped-evenodd-twice-expected.txt
similarity index 81%
copy from LayoutTests/svg/clip-path/clip-path-clipped-evenodd-twice-expected.txt
copy to LayoutTests/platform/linux/svg/clip-path/clip-path-clipped-evenodd-twice-expected.txt
index e87002c804001951ed4cdbf457d435615df3f2ce..9610943c3e81f6c2e73e11782f72428c66ac0f97 100644
--- a/LayoutTests/svg/clip-path/clip-path-clipped-evenodd-twice-expected.txt
+++ b/LayoutTests/platform/linux/svg/clip-path/clip-path-clipped-evenodd-twice-expected.txt
@@ -1,15 +1,15 @@
 layer at (0,0) size 800x600
   RenderView at (0,0) size 800x600
 layer at (0,0) size 800x600
-  RenderSVGRoot {svg} at (88,80) size 100x100
+  RenderSVGRoot {svg} at (87,79) size 102x102
     RenderSVGHiddenContainer {defs} at (0,0) size 0x0
       RenderSVGPath {path} at (40,40) size 200x170 [transform={m=((1.00,0.00)(0.00,1.00)) t=(40.00,40.00)}] [fill={[type=SOLID] [color=#000000]}] [data="M 100 0 L 160 170 L 0 60 L 200 60 L 30 170 Z"]
       RenderSVGResourceClipper {clipPath} [id="clipClip2"] [clipPathUnits=userSpaceOnUse]
         RenderSVGContainer {use} at (40,40) size 200x170
           RenderSVGPath {path} at (40,40) size 200x170 [transform={m=((1.00,0.00)(0.00,1.00)) t=(40.00,40.00)}] [fill={[type=SOLID] [color=#000000]}] [clip rule=EVEN-ODD] [data="M 100 0 L 160 170 L 0 60 L 200 60 L 30 170 Z"]
       RenderSVGResourceClipper {clipPath} [id="clipClip"] [clipPathUnits=userSpaceOnUse]
-        RenderSVGEllipse {circle} at (98,90) size 80x80 [fill={[type=SOLID] [color=#000000]}] [cx=138.00] [cy=130.00] [r=40.00]
+        RenderSVGEllipse {circle} at (97,89) size 82x82 [fill={[type=SOLID] [color=#000000]}] [cx=138.00] [cy=130.00] [r=40.00]
       RenderSVGResourceClipper {clipPath} [id="clip"] [clipPathUnits=userSpaceOnUse]
-        RenderSVGEllipse {circle} at (88,80) size 100x100 [fill={[type=SOLID] [color=#000000]}] [cx=138.00] [cy=130.00] [r=50.00]
-    RenderSVGRect {rect} at (88,80) size 100x100 [fill={[type=SOLID] [color=#008000]}] [x=40.00] [y=40.00] [width=300.00] [height=300.00]
-      [clipPath="clip"] RenderSVGResourceClipper {clipPath} at (88,80) size 100x100
+        RenderSVGEllipse {circle} at (87,79) size 102x102 [fill={[type=SOLID] [color=#000000]}] [cx=138.00] [cy=130.00] [r=50.00]
+    RenderSVGRect {rect} at (87,79) size 102x102 [fill={[type=SOLID] [color=#008000]}] [x=40.00] [y=40.00] [width=300.00] [height=300.00]
+      [clipPath="clip"] RenderSVGResourceClipper {clipPath} at (87.50,79.50) size 101x101