Move NG floats utility methods to the separate file

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

 // Copyright 2016 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 NGFloatingObject_h
 #define NGFloatingObject_h
 
 #include "core/layout/ng/geometry/ng_box_strut.h"
 #include "core/layout/ng/ng_block_node.h"
 #include "core/layout/ng/ng_constraint_space.h"
@@ skipping 32 matching lines @@
 
   // In the case where a legacy FloatingObject is attached to not its own
   // parent, e.g. a float surrounded by a bunch of nested empty divs,
   // NG float fragment's LeftOffset() cannot be used as legacy FloatingObject's
   // left offset because that offset should be relative to the original float
   // parent.
   // {@code left_offset} is calculated when we know to which parent this float
   // would be attached.
   LayoutUnit left_offset;
 
+  String ToString() const {

[ikilpatrick, 2017/03/17 21:25:24]

I know we haven't done this previously but we should probably surround all of
out ToString methods with
#ifndef NDEBUG

+    return String::format("Type: '%d' Fragment: '%s'", exclusion_type,
+                          fragment->ToString().ascii().data());
+  }
+
  private:
   NGFloatingObject(const NGConstraintSpace* space,
                    const NGConstraintSpace* parent_space,
                    const ComputedStyle& style,
                    const NGBoxStrut& margins,
                    NGPhysicalFragment* fragment)
       : space(space),
         original_parent_space(parent_space),
         margins(margins),
         fragment(fragment) {
     exclusion_type = NGExclusion::kFloatLeft;
     if (style.floating() == EFloat::kRight)
       exclusion_type = NGExclusion::kFloatRight;
     clear_type = style.clear();
   }
 };
 
 }  // namespace blink
 
 #endif  // NGFloatingObject_h