[LayoutNG] Add NGLayoutInputNode::ShowNodeTree

third_party/WebKit/Source/core/layout/ng/inline/ng_inline_node.cc

Index: third_party/WebKit/Source/core/layout/ng/inline/ng_inline_node.cc
diff --git a/third_party/WebKit/Source/core/layout/ng/inline/ng_inline_node.cc b/third_party/WebKit/Source/core/layout/ng/inline/ng_inline_node.cc
index 69d8228b78826676f56049225af9cf4af4e03f52..7c048de1350880c5663a48df6b6fc11c6512572a 100644
--- a/third_party/WebKit/Source/core/layout/ng/inline/ng_inline_node.cc
+++ b/third_party/WebKit/Source/core/layout/ng/inline/ng_inline_node.cc
@@ -228,7 +228,7 @@ NGLayoutInputNode* NGInlineNode::NextSibling() {
   return next_sibling_;
 }
 
-LayoutObject* NGInlineNode::GetLayoutObject() {
+LayoutObject* NGInlineNode::GetLayoutObject() const {
   return GetLayoutBlockFlow();
 }
 
@@ -365,6 +365,10 @@ void NGInlineNode::GetLayoutTextOffsets(
   }
 }
 
+String NGInlineNode::ToString() const {
+  return String::Format("NGInlineNode");
+}
+
 DEFINE_TRACE(NGInlineNode) {
   visitor->Trace(next_sibling_);
   NGLayoutInputNode::Trace(visitor);