Add container_block_offset,top_offset to NGFloatingObject.

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

Index: third_party/WebKit/Source/core/layout/ng/ng_floats_utils.h
diff --git a/third_party/WebKit/Source/core/layout/ng/ng_floats_utils.h b/third_party/WebKit/Source/core/layout/ng/ng_floats_utils.h
index 449b6c56915a51e996d891f51193fe5233c862e5..d35cfccedeb4a75f86419780e27c9c01843f87fa 100644
--- a/third_party/WebKit/Source/core/layout/ng/ng_floats_utils.h
+++ b/third_party/WebKit/Source/core/layout/ng/ng_floats_utils.h
@@ -18,10 +18,11 @@ CORE_EXPORT NGLogicalOffset PositionFloat(NGFloatingObject*,
                                           NGConstraintSpace* new_parent_space);
 
 // Positions the list of floats by updating their {@code logical_offset}.
-void PositionFloats(LayoutUnit origin_block_offset,
-                    LayoutUnit from_block_offset,
-                    const Vector<RefPtr<NGFloatingObject>>&,
-                    NGConstraintSpace*);
+CORE_EXPORT void PositionFloats(LayoutUnit origin_block_offset,
+                                LayoutUnit from_block_offset,
+                                LayoutUnit container_block_offset,
+                                const Vector<RefPtr<NGFloatingObject>>&,
+                                NGConstraintSpace*);
 }  // namespace blink
 
 #endif  // NGFloatsUtils_h