[LayoutNG] Split LayoutOpportunityIterator into separate file

third_party/WebKit/Source/core/layout/ng/ng_constraint_space.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 NGConstraintSpace_h
 #define NGConstraintSpace_h
 
 #include "core/CoreExport.h"
 #include "core/layout/LayoutBox.h"
 #include "core/layout/ng/ng_physical_constraint_space.h"
 #include "core/layout/ng/ng_writing_mode.h"
 #include "platform/heap/Handle.h"
 #include "wtf/text/WTFString.h"
 #include "wtf/Vector.h"
 
 namespace blink {
 
 class LayoutBox;
-class NGDerivedConstraintSpace;
 class NGFragment;
 class NGLayoutOpportunityIterator;
 
 // The NGConstraintSpace represents a set of constraints and available space
 // which a layout algorithm may produce a NGFragment within. It is a view on
 // top of a NGPhysicalConstraintSpace and provides accessor methods in the
 // logical coordinate system defined by the writing mode given.
 class CORE_EXPORT NGConstraintSpace final
     : public GarbageCollected<NGConstraintSpace> {
  public:
@@ skipping 83 matching lines @@
 
   String toString() const;
 
  private:
   Member<NGPhysicalConstraintSpace> physical_space_;
   NGLogicalOffset offset_;
   NGLogicalSize size_;
   unsigned writing_mode_ : 3;
 };
 
-class CORE_EXPORT NGLayoutOpportunityIterator final
-    : public GarbageCollectedFinalized<NGLayoutOpportunityIterator> {
- public:
-  NGLayoutOpportunityIterator(NGConstraintSpace* space,
-                              unsigned clear,
-                              bool for_inline_or_bfc);
-  ~NGLayoutOpportunityIterator() {}
-
-  NGConstraintSpace* Next();
-
-  DEFINE_INLINE_VIRTUAL_TRACE() {
-    visitor->trace(constraint_space_);
-    visitor->trace(current_opportunities_);
-  }
-
- private:
-  void computeForExclusion(unsigned index);
-  LayoutUnit heightForOpportunity(LayoutUnit left,
-                                  LayoutUnit top,
-                                  LayoutUnit right,
-                                  LayoutUnit bottom);
-  void addLayoutOpportunity(LayoutUnit left,
-                            LayoutUnit top,
-                            LayoutUnit right,
-                            LayoutUnit bottom);
-
-  Member<NGConstraintSpace> constraint_space_;
-  unsigned clear_;
-  bool for_inline_or_bfc_;
-  Vector<NGExclusion> filtered_exclusions_;
-  HeapVector<Member<NGConstraintSpace>> current_opportunities_;
-  unsigned current_exclusion_idx_;
-};
-
 inline std::ostream& operator<<(std::ostream& stream,
                                 const NGConstraintSpace& value) {
   return stream << value.toString();
 }
 
 }  // namespace blink
 
 #endif  // NGConstraintSpace_h