Compute snap offsets (both repeat and element based)

third_party/WebKit/Source/core/dom/Document.h

Index: third_party/WebKit/Source/core/dom/Document.h
diff --git a/third_party/WebKit/Source/core/dom/Document.h b/third_party/WebKit/Source/core/dom/Document.h
index 5ff715d10553ba2d0e2749cc27cc27004e200566..cfcba88bb923779258dd2e22519b3ea52b17363f 100644
--- a/third_party/WebKit/Source/core/dom/Document.h
+++ b/third_party/WebKit/Source/core/dom/Document.h
@@ -159,6 +159,7 @@ class SegmentedString;
 class SelectorQueryCache;
 class SerializedScriptValue;
 class Settings;
+class SnapCoordinator;
 class StyleEngine;
 class StyleResolver;
 class StyleSheet;
@@ -1052,6 +1053,8 @@ public:
     }
     int nodeCount() const { return m_nodeCount; }
 
+    SnapCoordinator* snapCoordinator();
+
     using WeakDocumentSet = HeapHashSet<WeakMember<Document>>;
     static WeakDocumentSet& liveDocumentSet();
 
@@ -1391,6 +1394,8 @@ private:
     int m_nodeCount;
 
     bool m_mayContainV0Shadow = false;
+
+    Member<SnapCoordinator> m_snapCoordinator;
 };
 
 extern template class CORE_EXTERN_TEMPLATE_EXPORT Supplement<Document>;