[LayoutNG] Add NGInlineBreakToken and back of NGInlineLayoutAlgorithm

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

+// Copyright 2017 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_inline_break_token.h"
+
+#include "core/layout/ng/ng_inline_node.h"
+
+namespace blink {
+
+NGInlineBreakToken::NGInlineBreakToken(NGInlineNode* node,
+                                       unsigned item_index,
+                                       unsigned text_offset)
+    : NGBreakToken(kInlineBreakToken, kUnfinished, node),
+      item_index_(item_index),
+      text_offset_(text_offset) {}
+
+NGInlineBreakToken::NGInlineBreakToken(NGLayoutInputNode* node)
+    : NGBreakToken(kInlineBreakToken, kFinished, node),
+      item_index_(0),
+      text_offset_(0) {}
+
+}  // namespace blink