[LayoutNG] Add NGInlineBreakToken and back of NGInlineLayoutAlgorithm

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

 // Copyright 2017 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_line_box_fragment_builder.h"
 
 #include "core/layout/ng/geometry/ng_logical_size.h"
 #include "core/layout/ng/ng_fragment.h"
+#include "core/layout/ng/ng_inline_break_token.h"
 #include "core/layout/ng/ng_inline_node.h"
 #include "core/layout/ng/ng_physical_line_box_fragment.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
 NGLineBoxFragmentBuilder::NGLineBoxFragmentBuilder(NGInlineNode* node)
     : direction_(TextDirection::kLtr), node_(node) {}
 
 NGLineBoxFragmentBuilder& NGLineBoxFragmentBuilder::SetDirection(
@@ skipping 20 matching lines @@
 void NGLineBoxFragmentBuilder::MoveChildrenInBlockDirection(LayoutUnit delta) {
   for (auto& offset : offsets_)
     offset.block_offset += delta;
 }
 
 void NGLineBoxFragmentBuilder::UniteMetrics(
     const NGLineHeightMetrics& metrics) {
   metrics_.Unite(metrics);
 }
 
+void NGLineBoxFragmentBuilder::SetBreakToken(
+    RefPtr<NGInlineBreakToken> break_token) {
+  break_token_ = std::move(break_token);
+}
+
 RefPtr<NGPhysicalLineBoxFragment>
 NGLineBoxFragmentBuilder::ToLineBoxFragment() {
   DCHECK_EQ(offsets_.size(), children_.size());
 
   NGWritingMode writing_mode(
       FromPlatformWritingMode(node_->Style().getWritingMode()));
   NGPhysicalSize physical_size =
       NGLogicalSize(inline_size_, Metrics().LineHeight())
           .ConvertToPhysical(writing_mode);
 
   for (size_t i = 0; i < children_.size(); ++i) {
     NGPhysicalFragment* child = children_[i].get();
     child->SetOffset(offsets_[i].ConvertToPhysical(
         writing_mode, direction_, physical_size, child->Size()));
   }
 
-  // TODO(kojii): Implement BreakToken.
-  return adoptRef(new NGPhysicalLineBoxFragment(physical_size, children_,
-                                                metrics_, nullptr));
+  return adoptRef(new NGPhysicalLineBoxFragment(
+      physical_size, children_, metrics_,
+      break_token_ ? std::move(break_token_)
+                   : NGInlineBreakToken::create(node_)));
 }
 
 }  // namespace blink