[LayoutNG] Introduce NGPhysicalFragment and make NGFragment a 'view'

third_party/WebKit/Source/core/layout/ng/ng_constraint_space.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 NGConstraintSpace_h
 #define NGConstraintSpace_h
 
 #include "core/CoreExport.h"
 #include "core/layout/ng/ng_physical_constraint_space.h"
 #include "core/layout/ng/ng_writing_mode.h"
@@ skipping 25 matching lines @@
                     const NGConstraintSpace* constraint_space)
       : physical_space_(constraint_space->PhysicalSpace()),
         writing_mode_(writing_mode) {}
 
   // TODO: This should either be removed or also take an offset (if we merge
   // this with NGDerivedConstraintSpace).
   NGConstraintSpace(const NGConstraintSpace& other,
                     NGLogicalSize container_size);
 
   NGPhysicalConstraintSpace* PhysicalSpace() const { return physical_space_; }
+
   NGWritingMode WritingMode() const {
     return static_cast<NGWritingMode>(writing_mode_);
   }
 
   // Size of the container. Used for the following three cases:
   // 1) Percentage resolution.
   // 2) Resolving absolute positions of children.
   // 3) Defining the threashold that triggers the presence of a scrollbar. Only
   //    applies if the corresponding scrollbarTrigger flag has been set for the
   //    direction.
@@ skipping 60 matching lines @@
 
  private:
   Persistent<NGConstraintSpace> constraint_space_;
   unsigned clear_;
   bool for_inline_or_bfc_;
 };
 
 }  // namespace blink
 
 #endif  // NGConstraintSpace_h