[LayoutNG] Add out-of-flow descendants and offsets to NGPhysicalFragment

third_party/WebKit/Source/core/layout/ng/ng_physical_fragment.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef NGPhysicalFragment_h
 #define NGPhysicalFragment_h
 
 #include "core/CoreExport.h"
 #include "core/layout/ng/ng_physical_fragment_base.h"
 #include "core/layout/ng/ng_units.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
+class NGBox;
+
 class CORE_EXPORT NGPhysicalFragment final : public NGPhysicalFragmentBase {
  public:
   // This modifies the passed-in children vector.
-  NGPhysicalFragment(NGPhysicalSize size,
-                     NGPhysicalSize overflow,
-                     HeapVector<Member<const NGPhysicalFragmentBase>>& children,
-                     NGMarginStrut margin_strut);
+  NGPhysicalFragment(
+      NGPhysicalSize size,
+      NGPhysicalSize overflow,
+      HeapVector<Member<const NGPhysicalFragmentBase>>& children,
+      HeapLinkedHashSet<WeakMember<NGBox>>& out_of_flow_descendants,
+      Vector<NGLogicalOffset> out_of_flow_offsets,
+      NGMarginStrut margin_strut);
 
   const HeapVector<Member<const NGPhysicalFragmentBase>>& Children() const {
     return children_;
   }
 
+  const HeapLinkedHashSet<WeakMember<NGBox>>& OutOfFlowDescendants() const {
+    return out_of_flow_descendants_;
+  }
+
+  const Vector<NGLogicalOffset>& OutOfFlowOffsets() const {
+    return out_of_flow_offsets_;
+  }
+
   NGMarginStrut MarginStrut() const { return margin_strut_; }
 
   DECLARE_TRACE_AFTER_DISPATCH();
 
  private:
   HeapVector<Member<const NGPhysicalFragmentBase>> children_;
-
+  HeapLinkedHashSet<WeakMember<NGBox>> out_of_flow_descendants_;
+  Vector<NGLogicalOffset> out_of_flow_offsets_;
   NGMarginStrut margin_strut_;
 };
 
 WILL_NOT_BE_EAGERLY_TRACED_CLASS(NGPhysicalFragment);
 
 DEFINE_TYPE_CASTS(NGPhysicalFragment,
                   NGPhysicalFragmentBase,
                   fragment,
                   fragment->Type() == NGPhysicalFragmentBase::FragmentBox,
                   fragment.Type() == NGPhysicalFragmentBase::FragmentBox);
 
 }  // namespace blink
 
 #endif  // NGPhysicalFragment_h