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

LayoutTests/platform/linux/svg/filters/feImage-filterUnits-objectBoundingBox-primitiveUnits-objectBoundingBox-expected.txt

Index: LayoutTests/platform/linux/svg/filters/feImage-filterUnits-objectBoundingBox-primitiveUnits-objectBoundingBox-expected.txt
diff --git a/LayoutTests/svg/filters/feImage-filterUnits-objectBoundingBox-primitiveUnits-objectBoundingBox-expected.txt b/LayoutTests/platform/linux/svg/filters/feImage-filterUnits-objectBoundingBox-primitiveUnits-objectBoundingBox-expected.txt
similarity index 92%
copy from LayoutTests/svg/filters/feImage-filterUnits-objectBoundingBox-primitiveUnits-objectBoundingBox-expected.txt
copy to LayoutTests/platform/linux/svg/filters/feImage-filterUnits-objectBoundingBox-primitiveUnits-objectBoundingBox-expected.txt
index a1ff55c8f3b0536eacb2d480deae6d89b73f206c..45a17e9c397adffc294ac77bfc28c7082261de84 100644
--- a/LayoutTests/svg/filters/feImage-filterUnits-objectBoundingBox-primitiveUnits-objectBoundingBox-expected.txt
+++ b/LayoutTests/platform/linux/svg/filters/feImage-filterUnits-objectBoundingBox-primitiveUnits-objectBoundingBox-expected.txt
@@ -3,15 +3,15 @@ layer at (0,0) size 800x800
 layer at (0,0) size 800x800
   RenderSVGRoot {svg} at (0,0) size 370x370
     RenderSVGHiddenContainer {defs} at (0,0) size 0x0
-      RenderSVGEllipse {circle} at (200,200) size 400x400 [fill={[type=SOLID] [color=#008000]}] [cx=400.00] [cy=400.00] [r=200.00]
+      RenderSVGEllipse {circle} at (199,199) size 402x402 [fill={[type=SOLID] [color=#008000]}] [cx=400.00] [cy=400.00] [r=200.00]
       RenderSVGResourceFilter {filter} [id="filter1a-rel"] [filterUnits=objectBoundingBox] [primitiveUnits=objectBoundingBox]
-        [feImage image-size="400x400"]
+        [feImage image-size="402x402"]
       RenderSVGResourceFilter {filter} [id="filter1b-rel"] [filterUnits=objectBoundingBox] [primitiveUnits=objectBoundingBox]
-        [feImage image-size="400x400"]
+        [feImage image-size="402x402"]
       RenderSVGResourceFilter {filter} [id="filter2a-rel"] [filterUnits=objectBoundingBox] [primitiveUnits=objectBoundingBox]
-        [feImage image-size="400x400"]
+        [feImage image-size="402x402"]
       RenderSVGResourceFilter {filter} [id="filter2b-rel"] [filterUnits=objectBoundingBox] [primitiveUnits=objectBoundingBox]
-        [feImage image-size="400x400"]
+        [feImage image-size="402x402"]
     RenderSVGContainer {g} at (0,0) size 350x200
       RenderSVGRect {rect} at (49,49) size 102x102 [stroke={[type=SOLID] [color=#FF0000]}] [x=50.00] [y=50.00] [width=100.00] [height=100.00]
       RenderSVGRect {rect} at (0,0) size 200x200 [fill={[type=SOLID] [color=#FF0000]}] [x=0.00] [y=0.00] [width=200.00] [height=200.00]