Compute snap offsets (both repeat and element based)

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

Index: third_party/WebKit/Source/core/layout/LayoutObject.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutObject.cpp b/third_party/WebKit/Source/core/layout/LayoutObject.cpp
index f4b615a98126bd464e28e838a099c7a38c4dd609..5222d50f6deca0770535f9b6ea7467d16de8bf85 100644
--- a/third_party/WebKit/Source/core/layout/LayoutObject.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutObject.cpp
@@ -1214,7 +1214,7 @@ void LayoutObject::invalidatePaintUsingContainer(const LayoutBoxModelObject& pai
         "info", jsonObjectForPaintInvalidationInfo(dirtyRect, paintInvalidationReasonToString(invalidationReason)));
 
     // This conditional handles situations where non-rooted (and hence non-composited) frames are
-    // painted, such as SVG images. 
+    // painted, such as SVG images.
     if (!paintInvalidationContainer.isPaintInvalidationContainer())
         invalidatePaintRectangleOnWindow(paintInvalidationContainer, enclosingIntRect(dirtyRect));
 
@@ -1238,7 +1238,7 @@ void LayoutObject::invalidateDisplayItemClient(const DisplayItemClientWrapper& d
 }
 
 void LayoutObject::invalidateDisplayItemClients(const LayoutBoxModelObject& paintInvalidationContainer, PaintInvalidationReason invalidationReason, const LayoutRect& previousPaintInvalidationRect, const LayoutRect& newPaintInvalidationRect) const
-{ 
+{
     paintInvalidationContainer.invalidateDisplayItemClientOnBacking(*this, invalidationReason, previousPaintInvalidationRect, newPaintInvalidationRect);
 
     if (PaintLayer* enclosingLayer = this->enclosingLayer())