[LayoutNG] Compute baseline from fragment tree

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

Index: third_party/WebKit/Source/core/layout/ng/ng_fragment_builder.cc
diff --git a/third_party/WebKit/Source/core/layout/ng/ng_fragment_builder.cc b/third_party/WebKit/Source/core/layout/ng/ng_fragment_builder.cc
index f8cc737256746d1dc8dccb1b1ea71eca21d57307..edf3598f0f9c165e62563e049e9b4d4ca4961d4b 100644
--- a/third_party/WebKit/Source/core/layout/ng/ng_fragment_builder.cc
+++ b/third_party/WebKit/Source/core/layout/ng/ng_fragment_builder.cc
@@ -4,6 +4,7 @@
 
 #include "core/layout/ng/ng_fragment_builder.h"
 
+#include "core/layout/ng/inline/ng_physical_line_box_fragment.h"
 #include "core/layout/ng/inline/ng_physical_text_fragment.h"
 #include "core/layout/ng/ng_block_break_token.h"
 #include "core/layout/ng/ng_block_node.h"
@@ -192,6 +193,12 @@ NGFragmentBuilder& NGFragmentBuilder::AddOutOfFlowDescendant(
   return *this;
 }
 
+void NGFragmentBuilder::AddBaseline(NGBaselineAlgorithmType algorithm_type,
+                                    FontBaseline baseline_type,
+                                    LayoutUnit offset) {
+  baselines_.push_back(NGBaseline{algorithm_type, baseline_type, offset});
+}
+
 RefPtr<NGLayoutResult> NGFragmentBuilder::ToBoxFragment() {
   DCHECK_EQ(type_, NGPhysicalFragment::kFragmentBox);
   DCHECK_EQ(offsets_.size(), children_.size());
@@ -229,8 +236,8 @@ RefPtr<NGLayoutResult> NGFragmentBuilder::ToBoxFragment() {
 
   RefPtr<NGPhysicalBoxFragment> fragment = AdoptRef(new NGPhysicalBoxFragment(
       layout_object_, physical_size, overflow_.ConvertToPhysical(writing_mode_),
-      children_, positioned_floats_, border_edges_.ToPhysical(writing_mode_),
-      std::move(break_token)));
+      children_, positioned_floats_, baselines_,
+      border_edges_.ToPhysical(writing_mode_), std::move(break_token)));
 
   return AdoptRef(
       new NGLayoutResult(std::move(fragment), oof_positioned_descendants_,