[LayoutNG] Fix orthogonal writing mode child margin strut from being used in collapsing margins cal…

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"
 #include "wtf/Vector.h"
 
 namespace blink {
 
 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)
-      : NGPhysicalFragmentBase(size, overflow, FragmentBox, margin_strut) {
+      : NGPhysicalFragmentBase(size, overflow, FragmentBox),
+        margin_strut_(margin_strut) {
     children_.swap(children);
   }
 
   const HeapVector<Member<const NGPhysicalFragmentBase>>& Children() const {
     return children_;
   }
 
+  NGMarginStrut MarginStrut() const { return margin_strut_; }
+
   DEFINE_INLINE_TRACE_AFTER_DISPATCH() {
     visitor->trace(children_);
     NGPhysicalFragmentBase::traceAfterDispatch(visitor);
   }
 
  private:
   HeapVector<Member<const NGPhysicalFragmentBase>> children_;
+
+  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