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

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

Index: third_party/WebKit/Source/core/layout/ng/ng_block_node.cc
diff --git a/third_party/WebKit/Source/core/layout/ng/ng_block_node.cc b/third_party/WebKit/Source/core/layout/ng/ng_block_node.cc
index 67a33262b55619d52b3d2e87240cd676a431d969..24eba1f84a15591d62213ad1b55df2e15e8c3028 100644
--- a/third_party/WebKit/Source/core/layout/ng/ng_block_node.cc
+++ b/third_party/WebKit/Source/core/layout/ng/ng_block_node.cc
@@ -86,8 +86,8 @@ NGBlockNode::NGBlockNode(ComputedStyle* style)
 // 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_);
@@ -95,9 +95,9 @@ RefPtr<NGLayoutResult> NGBlockNode::Layout(
     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_;
@@ -207,11 +207,6 @@ 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_);