[LayoutNG] Add NGLineBoxFragment

third_party/WebKit/Source/core/layout/ng/ng_physical_fragment.cc

 // 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.
 
 #include "core/layout/ng/ng_physical_fragment.h"
 
 #include "core/layout/ng/ng_break_token.h"
 #include "core/layout/ng/ng_physical_box_fragment.h"
+#include "core/layout/ng/ng_physical_line_box_fragment.h"
 #include "core/layout/ng/ng_physical_text_fragment.h"
 
 namespace blink {
 
 NGPhysicalFragment::NGPhysicalFragment(LayoutObject* layout_object,
                                        NGPhysicalSize size,
-                                       NGPhysicalSize overflow,
                                        NGFragmentType type,
                                        RefPtr<NGBreakToken> break_token)
     : layout_object_(layout_object),
       size_(size),
-      overflow_(overflow),
       break_token_(std::move(break_token)),
       type_(type),
       is_placed_(false) {}
 
 void NGPhysicalFragment::destroy() const {
-  if (Type() == kFragmentText)
-    delete static_cast<const NGPhysicalTextFragment*>(this);
-  else
-    delete static_cast<const NGPhysicalBoxFragment*>(this);
+  switch (Type()) {
+    case kFragmentBox:
+      delete static_cast<const NGPhysicalBoxFragment*>(this);
+      break;
+    case kFragmentText:
+      delete static_cast<const NGPhysicalTextFragment*>(this);
+      break;
+    case kFragmentLineBox:
+      delete static_cast<const NGPhysicalLineBoxFragment*>(this);
+      break;
+    default:
+      NOTREACHED();
+      break;
+  }
 }
 
 const ComputedStyle& NGPhysicalFragment::Style() const {
   DCHECK(layout_object_);
   return layout_object_->styleRef();
 }
 
 String NGPhysicalFragment::ToString() const {
   return String::format("Type: '%d' Size: '%s' Offset: '%s' Placed: '%d'",
                         Type(), Size().ToString().ascii().data(),
                         Offset().ToString().ascii().data(), IsPlaced());
 }
 
 }  // namespace blink