[LayoutNG] Add NGLineBoxFragment

third_party/WebKit/Source/core/layout/ng/ng_text_fragment_builder.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_text_fragment_builder.h"
+
+#include "core/layout/ng/ng_fragment.h"
+#include "core/layout/ng/ng_inline_node.h"
+#include "core/layout/ng/ng_physical_text_fragment.h"
+#include "platform/heap/Handle.h"
+
+namespace blink {
+
+NGTextFragmentBuilder::NGTextFragmentBuilder(NGInlineNode* node)
+    : direction_(TextDirection::kLtr), node_(node) {}
+
+NGTextFragmentBuilder& NGTextFragmentBuilder::SetDirection(
+    TextDirection direction) {
+  direction_ = direction;
+  return *this;
+}
+
+NGTextFragmentBuilder& NGTextFragmentBuilder::SetInlineSize(LayoutUnit size) {
+  size_.inline_size = size;
+  return *this;
+}
+
+NGTextFragmentBuilder& NGTextFragmentBuilder::SetBlockSize(LayoutUnit size) {
+  size_.block_size = size;
+  return *this;
+}
+
+void NGTextFragmentBuilder::UniteMetrics(const NGLineHeightMetrics& metrics) {
+  metrics_.Unite(metrics);
+}
+
+RefPtr<NGPhysicalTextFragment> NGTextFragmentBuilder::ToTextFragment(
+    unsigned index,
+    unsigned start_offset,
+    unsigned end_offset) {
+  NGWritingMode writing_mode(
+      FromPlatformWritingMode(node_->BlockStyle()->getWritingMode()));
+  return adoptRef(new NGPhysicalTextFragment(
+      node_->GetLayoutObject(), node_, index, start_offset, end_offset,
+      size_.ConvertToPhysical(writing_mode)));
+}
+
+}  // namespace blink