Place the out of flow positioned blocks

third_party/WebKit/Source/core/layout/ng/ng_units.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 NGUnits_h
 #define NGUnits_h
 
 #include "core/CoreExport.h"
 #include "core/layout/ng/ng_writing_mode.h"
 #include "platform/LayoutUnit.h"
@@ skipping 87 matching lines @@
 // its parent rect in the physical coordinate system.
 struct NGPhysicalOffset {
   NGPhysicalOffset() {}
   NGPhysicalOffset(LayoutUnit left, LayoutUnit top) : left(left), top(top) {}
 
   LayoutUnit left;
   LayoutUnit top;
 
   NGPhysicalOffset operator+(const NGPhysicalOffset& other) const;
   NGPhysicalOffset& operator+=(const NGPhysicalOffset& other);
+  NGPhysicalOffset operator-(const NGPhysicalOffset& other) const;
+  NGPhysicalOffset& operator-=(const NGPhysicalOffset& other);
 };
 
 struct NGPhysicalSize {
   NGPhysicalSize() {}
   NGPhysicalSize(LayoutUnit width, LayoutUnit height)
       : width(width), height(height) {}
 
   LayoutUnit width;
   LayoutUnit height;
 
@@ skipping 185 matching lines @@
 struct CORE_EXPORT NGStaticPosition {
   enum Type { kTopLeft, kTopRight, kBottomLeft, kBottomRight };
 
   Type type;  // Logical corner that corresponds to physical top left.
   NGPhysicalOffset offset;
 
   // Creates a position with proper type wrt writing mode and direction.
   static NGStaticPosition Create(NGWritingMode,
                                  TextDirection,
                                  NGPhysicalOffset);
-
   // Left/Right/TopPosition functions map static position to
   // left/right/top edge wrt container space.
   // The function arguments are required to solve the equation:
   // contaner_size = left + margin_left + width + margin_right + right
   LayoutUnit LeftPosition(LayoutUnit container_size,
                           LayoutUnit width,
                           LayoutUnit margin_left,
                           LayoutUnit margin_right) const {
     return GenericPosition(HasLeft(), offset.left, container_size, width,
                            margin_left, margin_right);
@@ skipping 27 matching lines @@
     if (position_matches)
       return position;
     else
       return container_size - position - length - margin_start - margin_end;
   }
 };
 
 }  // namespace blink
 
 #endif  // NGUnits_h