Use Opportunity Iterator to position text fragments in NGLineBuilder

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

Index: third_party/WebKit/Source/core/layout/ng/ng_constraint_space.h
diff --git a/third_party/WebKit/Source/core/layout/ng/ng_constraint_space.h b/third_party/WebKit/Source/core/layout/ng/ng_constraint_space.h
index 9fdb2b09094a4c5a52605261b61d81ae08bbf86e..a3e36d4a51a60a12e5d4107123e3fe189dee9d7d 100644
--- a/third_party/WebKit/Source/core/layout/ng/ng_constraint_space.h
+++ b/third_party/WebKit/Source/core/layout/ng/ng_constraint_space.h
@@ -108,7 +108,11 @@ class CORE_EXPORT NGConstraintSpace final
   // 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.