[LayoutNG] Introduce NGPositionedFloat.

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

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef NGFloatsUtils_h
 #define NGFloatsUtils_h
 
 #include "core/layout/ng/geometry/ng_logical_offset.h"
 #include "core/layout/ng/ng_constraint_space.h"
 #include "core/layout/ng/ng_floating_object.h"
 #include "core/layout/ng/ng_fragment_builder.h"
+#include "core/layout/ng/ng_positioned_float.h"
 
 namespace blink {
 
 // Positions {@code floating_object} into {@code new_parent_space}.
-// @returns Logical offset of the positioned float.
-CORE_EXPORT NGLogicalOffset PositionFloat(NGFloatingObject*,
-                                          NGConstraintSpace* new_parent_space);
+// @returns A positioned float.
+CORE_EXPORT NGPositionedFloat
+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*);
+// Positions the list of {@code floating_objects}. Adds them as exclusions to
+// {@code space}.
+CORE_EXPORT const Vector<NGPositionedFloat> PositionFloats(
+    LayoutUnit origin_block_offset,
+    LayoutUnit from_block_offset,
+    const Vector<RefPtr<NGFloatingObject>>& floating_objects,
+    NGConstraintSpace* space);
+
 }  // namespace blink
 
 #endif  // NGFloatsUtils_h