[LayoutNG] Add NGInlineBreakToken and back of NGInlineLayoutAlgorithm

third_party/WebKit/Source/core/layout/ng/ng_text_layout_algorithm.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 NGInlineLayoutAlgorithm_h
-#define NGInlineLayoutAlgorithm_h
-
-#include "core/CoreExport.h"
-#include "core/layout/ng/ng_break_token.h"
-#include "core/layout/ng/ng_layout_algorithm.h"
-#include "platform/heap/Handle.h"
-
-namespace blink {
-
-class NGInlineNode;
-class NGLineBuilder;
-
-// A class for text layout. This takes a NGInlineNode which consists only
-// non-atomic inlines and produces NGTextFragments.
-//
-// Unlike other layout algorithms this takes a NGInlineNode as its input instead
-// of the ComputedStyle as it operates over multiple inlines with different
-// style.
-class CORE_EXPORT NGTextLayoutAlgorithm : public NGLayoutAlgorithm {
- public:
-  // Default constructor.
-  // @param inline_box The inline box to produce fragments from.
-  // @param space The constraint space which the algorithm should generate a
-  //              fragments within.
-  NGTextLayoutAlgorithm(NGInlineNode* inline_box,
-                        NGBreakToken* break_token = nullptr);
-
-  RefPtr<NGLayoutResult> Layout() override;
-  void LayoutInline(NGLineBuilder*);
-
- private:
-  Persistent<NGInlineNode> inline_box_;
-  NGBreakToken* break_token_;
-
-  friend class NGInlineNodeTest;
-};
-
-}  // namespace blink
-
-#endif  // NGInlineLayoutAlgorithm_h