[layout-ng] Convert ng_block_layout_algorithm to yield to the coordinator

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

Index: third_party/WebKit/Source/core/layout/ng/ng_layout_coordinator.h
diff --git a/third_party/WebKit/Source/core/layout/ng/ng_layout_coordinator.h b/third_party/WebKit/Source/core/layout/ng/ng_layout_coordinator.h
index b4f8628e3f314f604f1394f32caa344acf2d0de8..6926e1d62949cd1d4ff5505b24a48b7765c0c642 100644
--- a/third_party/WebKit/Source/core/layout/ng/ng_layout_coordinator.h
+++ b/third_party/WebKit/Source/core/layout/ng/ng_layout_coordinator.h
@@ -24,8 +24,14 @@ class CORE_EXPORT NGLayoutCoordinator final
 
   DECLARE_TRACE()
 
+  const HeapVector<Member<NGLayoutAlgorithm>>& GetAlgorithmStackForTesting()
+      const {
+    return layout_algorithms_;
+  };
+
  private:
   HeapVector<Member<NGLayoutAlgorithm>> layout_algorithms_;
+  Member<NGPhysicalFragmentBase> fragment_;
 };
 }