[LayoutNG] Compute baseline from fragment tree

third_party/WebKit/Source/core/layout/ng/ng_constraint_space.h

Index: third_party/WebKit/Source/core/layout/ng/ng_constraint_space.h
diff --git a/third_party/WebKit/Source/core/layout/ng/ng_constraint_space.h b/third_party/WebKit/Source/core/layout/ng/ng_constraint_space.h
index e33bdc9017a0f9f9ad5778157c3dcc7356238788..21fe72890d78bc8aa19a6e14d6946a9c5c389141 100644
--- a/third_party/WebKit/Source/core/layout/ng/ng_constraint_space.h
+++ b/third_party/WebKit/Source/core/layout/ng/ng_constraint_space.h
@@ -10,6 +10,7 @@
 #include "core/layout/ng/geometry/ng_logical_size.h"
 #include "core/layout/ng/geometry/ng_margin_strut.h"
 #include "core/layout/ng/geometry/ng_physical_size.h"
+#include "core/layout/ng/inline/ng_baseline.h"
 #include "core/layout/ng/ng_exclusion.h"
 #include "core/layout/ng/ng_unpositioned_float.h"
 #include "core/layout/ng/ng_writing_mode.h"
@@ -155,6 +156,10 @@ class CORE_EXPORT NGConstraintSpace final
     return clearance_offset_;
   }
 
+  const Vector<NGBaselineRequest>& BaselineRequests() const {
+    return baseline_requests_;
+  }
+
   bool operator==(const NGConstraintSpace&) const;
   bool operator!=(const NGConstraintSpace&) const;
 
@@ -182,7 +187,8 @@ class CORE_EXPORT NGConstraintSpace final
                     const WTF::Optional<NGLogicalOffset>& floats_bfc_offset,
                     const std::shared_ptr<NGExclusions>& exclusions,
                     Vector<RefPtr<NGUnpositionedFloat>>& unpositioned_floats,
-                    const WTF::Optional<LayoutUnit>& clearance_offset);
+                    const WTF::Optional<LayoutUnit>& clearance_offset,
+                    Vector<NGBaselineRequest>& baseline_requests);
 
   NGPhysicalSize InitialContainingBlockSize() const {
     return initial_containing_block_size_;
@@ -220,6 +226,8 @@ class CORE_EXPORT NGConstraintSpace final
   const std::shared_ptr<NGExclusions> exclusions_;
   WTF::Optional<LayoutUnit> clearance_offset_;
   Vector<RefPtr<NGUnpositionedFloat>> unpositioned_floats_;
+
+  Vector<NGBaselineRequest> baseline_requests_;
 };
 
 inline std::ostream& operator<<(std::ostream& stream,