[LayoutNG] Allow block-flow layout to be fragmented using new approach.

third_party/WebKit/Source/core/layout/ng/ng_block_node.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_block_node.h"
 
 #include "core/layout/LayoutBlockFlow.h"
 #include "core/layout/api/LineLayoutAPIShim.h"
 #include "core/layout/line/InlineIterator.h"
 #include "core/layout/ng/layout_ng_block_flow.h"
@@ skipping 68 matching lines @@
       layout_box_(nullptr),
       style_(style) {
   DCHECK(style_);
 }
 
 // Need an explicit destructor in the .cc file, or the MSWIN compiler will
 // produce an error when attempting to generate a default one, if the .h file is
 // included from a compilation unit that lacks the ComputedStyle definition.
 NGBlockNode::~NGBlockNode() {}
 
-RefPtr<NGLayoutResult> NGBlockNode::Layout(
-    NGConstraintSpace* constraint_space) {
+RefPtr<NGLayoutResult> NGBlockNode::Layout(NGConstraintSpace* constraint_space,
+                                           NGBreakToken* break_token) {
   // Use the old layout code and synthesize a fragment.
   if (!CanUseNewLayout()) {
     DCHECK(layout_box_);
     layout_result_ = RunOldLayout(*constraint_space);
     return layout_result_;
   }
 
-  layout_result_ =
-      NGBlockLayoutAlgorithm(this, constraint_space, CurrentBreakToken())
-          .Layout();
+  layout_result_ = NGBlockLayoutAlgorithm(this, constraint_space,
+                                          toNGBlockBreakToken(break_token))
+                       .Layout();
 
   CopyFragmentDataToLayoutBox(*constraint_space);
   return layout_result_;
 }
 
 MinAndMaxContentSizes NGBlockNode::ComputeMinAndMaxContentSizes() {
   MinAndMaxContentSizes sizes;
   if (!CanUseNewLayout()) {
     DCHECK(layout_box_);
     // TODO(layout-ng): This could be somewhat optimized by directly calling
@@ skipping 89 matching lines @@
 }
 
 void NGBlockNode::SetNextSibling(NGLayoutInputNode* sibling) {
   next_sibling_ = sibling;
 }
 
 void NGBlockNode::SetFirstChild(NGLayoutInputNode* child) {
   first_child_ = child;
 }
 
-NGBreakToken* NGBlockNode::CurrentBreakToken() const {
-  return layout_result_ ? layout_result_->PhysicalFragment()->BreakToken()
-                        : nullptr;
-}
-
 DEFINE_TRACE(NGBlockNode) {
   visitor->trace(next_sibling_);
   visitor->trace(first_child_);
   NGLayoutInputNode::trace(visitor);
 }
 
 bool NGBlockNode::CanUseNewLayout() {
   if (!layout_box_)
     return true;
   if (!layout_box_->isLayoutBlockFlow())
@@ skipping 144 matching lines @@
 // Save static position for legacy AbsPos layout.
 void NGBlockNode::SaveStaticOffsetForLegacy(const NGLogicalOffset& offset) {
   DCHECK(layout_box_);
   DCHECK(layout_box_->isOutOfFlowPositioned());
   DCHECK(layout_box_->layer());
   layout_box_->layer()->setStaticBlockPosition(offset.block_offset);
   layout_box_->layer()->setStaticInlinePosition(offset.inline_offset);
 }
 
 }  // namespace blink