WIP: snap-width

third_party/WebKit/Source/core/layout/LayoutBox.cpp

Index: third_party/WebKit/Source/core/layout/LayoutBox.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutBox.cpp b/third_party/WebKit/Source/core/layout/LayoutBox.cpp
index 61fad6199d87245b7d5b117528fce8994b9c6100..0efbf131a6fe318b113e2349e70d6ca66f9830f1 100644
--- a/third_party/WebKit/Source/core/layout/LayoutBox.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutBox.cpp
@@ -591,6 +591,19 @@ void LayoutBox::updateLayerTransformAfterLayout()
         layer()->updateTransformationMatrix();
 }
 
+LayoutUnit LayoutBox::snapContentLogicalWidth() const
+{
+    LayoutUnit width = contentLogicalWidth();
+    if (width <= 0)
+        return width;
+    LayoutUnit unit = styleRef().snapWidth();
+    ASSERT(unit > 0);
+    LayoutUnit mod = intMod(width, unit);
+    if (!mod)
+        return width;
+    return LayoutUnit((width - mod).ceil());
+}
+
 LayoutUnit LayoutBox::constrainLogicalWidthByMinMax(LayoutUnit logicalWidth, LayoutUnit availableWidth, LayoutBlock* cb) const
 {
     const ComputedStyle& styleToUse = styleRef();