Use Opportunity Iterator to position text fragments in NGLineBuilder

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/ng/geometry/ng_logical_offset.h"
 #include "core/layout/ng/geometry/ng_logical_size.h"
@@ skipping 90 matching lines @@
   bool IsFixedSizeBlock() const { return is_fixed_size_block_; }
 
   // Whether an auto inline-size should be interpreted as shrink-to-fit
   // (ie. fit-content). This is used for inline-block, floats, etc.
   bool IsShrinkToFit() const { return is_shrink_to_fit_; }
 
   // If specified a layout should produce a Fragment which fragments at the
   // blockSize if possible.
   NGFragmentationType BlockFragmentationType() const;
 
-  NGLayoutOpportunityIterator* LayoutOpportunityIterator();
+  // Returns a pointer to already existing Layout Opportunity iterator
+  // associated with this constraint space and {@code iter_offset} or creates a
+  // new one.
+  NGLayoutOpportunityIterator* LayoutOpportunityIterator(
+      const NGLogicalOffset& iter_offset);
 
   // Return true if this contraint space participates in a fragmentation
   // context.
   bool HasBlockFragmentation() const {
     return BlockFragmentationType() != kFragmentNone;
   }
 
   NGMarginStrut MarginStrut() const { return margin_strut_; }
 
   NGLogicalOffset BfcOffset() const { return bfc_offset_; }
@@ skipping 63 matching lines @@
 };
 
 inline std::ostream& operator<<(std::ostream& stream,
                                 const NGConstraintSpace& value) {
   return stream << value.ToString();
 }
 
 }  // namespace blink
 
 #endif  // NGConstraintSpace_h