[layoutng] Margin support, part 1

third_party/WebKit/Source/core/style/StyleSurroundData.h

Index: third_party/WebKit/Source/core/style/StyleSurroundData.h
diff --git a/third_party/WebKit/Source/core/style/StyleSurroundData.h b/third_party/WebKit/Source/core/style/StyleSurroundData.h
index a060f9a63597b3468dc92b0bd9248c72c87812d8..016ae5055972a675b6fe36333c924de0cb24dc3c 100644
--- a/third_party/WebKit/Source/core/style/StyleSurroundData.h
+++ b/third_party/WebKit/Source/core/style/StyleSurroundData.h
@@ -35,7 +35,7 @@ namespace blink {
 // TODO(sashab): Move this into a private class on ComputedStyle, and remove
 // all methods on it, merging them into copy/creation methods on ComputedStyle
 // instead. Keep the allocation logic, only allocating a new object if needed.
-class StyleSurroundData : public RefCounted<StyleSurroundData> {
+class CORE_EXPORT StyleSurroundData : public RefCounted<StyleSurroundData> {
 public:
     static PassRefPtr<StyleSurroundData> create() { return adoptRef(new StyleSurroundData); }
     PassRefPtr<StyleSurroundData> copy() const { return adoptRef(new StyleSurroundData(*this)); }