Fix the check for divide-by-zero in background image tiling

third_party/WebKit/Source/core/paint/BackgroundImageGeometry.cpp

Index: third_party/WebKit/Source/core/paint/BackgroundImageGeometry.cpp
diff --git a/third_party/WebKit/Source/core/paint/BackgroundImageGeometry.cpp b/third_party/WebKit/Source/core/paint/BackgroundImageGeometry.cpp
index d403ec761ee292d5ddeb428a020ef3dc56d9a926..3015c25d4a19634db0f35c657bfe56596642acc8 100644
--- a/third_party/WebKit/Source/core/paint/BackgroundImageGeometry.cpp
+++ b/third_party/WebKit/Source/core/paint/BackgroundImageGeometry.cpp
@@ -301,7 +301,7 @@ void BackgroundImageGeometry::calculate(const LayoutBoxModelObject& obj, const L
         setPhaseX(tileSize().width() ? LayoutUnit(tileSize().width() - fmodf((xOffset + left), tileSize().width()))
             : LayoutUnit());
         setSpaceSize(LayoutSize());
-    } else if (backgroundRepeatX == SpaceFill && fillTileSize.width() > LayoutUnit()) {
+    } else if (backgroundRepeatX == SpaceFill && tileSize().width() > LayoutUnit()) {
         LayoutUnit space = getSpaceBetweenImageTiles(positioningAreaSize.width(), tileSize().width());
         LayoutUnit actualWidth = tileSize().width() + space;
 
@@ -324,7 +324,7 @@ void BackgroundImageGeometry::calculate(const LayoutBoxModelObject& obj, const L
         setPhaseY(tileSize().height() ? LayoutUnit(tileSize().height() - fmodf((yOffset + top), tileSize().height()))
             : LayoutUnit());
         setSpaceSize(LayoutSize(spaceSize().width(), LayoutUnit()));
-    } else if (backgroundRepeatY == SpaceFill && fillTileSize.height() > LayoutUnit()) {
+    } else if (backgroundRepeatY == SpaceFill && tileSize().height() > LayoutUnit()) {
         LayoutUnit space = getSpaceBetweenImageTiles(positioningAreaSize.height(), tileSize().height());
         LayoutUnit actualHeight = tileSize().height() + space;