Use Opportunity Iterator to position text fragments in NGLineBuilder

third_party/WebKit/Source/core/layout/ng/ng_text_layout_algorithm.cc

 // 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.
 
 #include "core/layout/ng/ng_text_layout_algorithm.h"
 
 #include "core/layout/ng/ng_box_fragment.h"
 #include "core/layout/ng/ng_break_token.h"
 #include "core/layout/ng/ng_constraint_space.h"
 #include "core/layout/ng/ng_fragment_builder.h"
 #include "core/layout/ng/ng_inline_node.h"
+#include "core/layout/ng/ng_layout_opportunity_iterator.h"
 #include "core/layout/ng/ng_line_builder.h"
 #include "core/layout/ng/ng_text_fragment.h"
 #include "core/style/ComputedStyle.h"
 #include "platform/text/TextBreakIterator.h"
 
 namespace blink {
 
 NGTextLayoutAlgorithm::NGTextLayoutAlgorithm(
     NGInlineNode* inline_box,
     NGConstraintSpace* constraint_space,
@@ skipping 43 matching lines @@
     unsigned start_of_hangables = current_offset;
     while (current_offset < end_offset &&
            IsHangable(text_content[current_offset]))
       current_offset++;
 
     // Set the end to the next break opportunity.
     line_builder->SetEnd(current_offset);
 
     // If there are more available spaces, mark the break opportunity and fetch
     // more text.
+    // TODO(layout-ng): check if the height of the linebox can fit within
+    // the current opportunity.
     if (line_builder->CanFitOnLine()) {
       line_builder->SetBreakOpportunity();
       continue;
     }
 
     // Compute hangable characters if exists.
     if (current_offset != start_of_hangables) {
       line_builder->SetStartOfHangables(start_of_hangables);
       // If text before hangables can fit, include it in the current line.
       if (line_builder->CanFitOnLine())
@@ skipping 19 matching lines @@
     }
   }
 
   // If inline children ended with items left in the line builder, create a line
   // for them.
   if (line_builder->HasItems())
     line_builder->CreateLine();
 }
 
 }  // namespace blink