[LayoutNG] Add NGConstraintSpaceBuilder class.

third_party/WebKit/Source/core/layout/ng/ng_constraint_space_builder.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_constraint_space_builder.h"
+
+namespace blink {
+
+NGConstraintSpaceBuilder::NGConstraintSpaceBuilder(NGWritingMode writing_mode)
+    : writing_mode_(writing_mode) {}
+
+NGConstraintSpaceBuilder& NGConstraintSpaceBuilder::SetContainerSize(
+    NGLogicalSize container_size) {
+  container_size_ = container_size;
+  return *this;
+}
+
+NGConstraintSpaceBuilder& NGConstraintSpaceBuilder::SetFixedSize(
+    bool fixed_inline,
+    bool fixed_block) {
+  fixed_inline_ = fixed_inline;
+  fixed_block_ = fixed_block;
+  return *this;
+}
+
+NGConstraintSpaceBuilder&
+NGConstraintSpaceBuilder::SetOverflowTriggersScrollbar(
+    bool inline_direction_triggers_scrollbar,
+    bool block_direction_triggers_scrollbar) {
+  inline_direction_triggers_scrollbar_ = inline_direction_triggers_scrollbar;
+  block_direction_triggers_scrollbar_ = block_direction_triggers_scrollbar;
+  return *this;
+}
+
+NGConstraintSpaceBuilder& NGConstraintSpaceBuilder::SetFragmentationType(
+    NGFragmentationType fragmentation_type) {
+  fragmentation_type_ = fragmentation_type;
+  return *this;
+}
+
+NGConstraintSpaceBuilder& NGConstraintSpaceBuilder::SetIsNewFormattingContext(
+    bool is_new_fc) {
+  is_new_fc_ = is_new_fc;
+  return *this;
+}
+
+NGPhysicalConstraintSpace* NGConstraintSpaceBuilder::ToConstraintSpace() {
+  NGPhysicalSize container_size = container_size_.ConvertToPhysical(
+      static_cast<NGWritingMode>(writing_mode_));
+  if (writing_mode_ == HorizontalTopBottom) {
+    return new NGPhysicalConstraintSpace(
+        container_size, fixed_inline_, fixed_block_,
+        inline_direction_triggers_scrollbar_,
+        block_direction_triggers_scrollbar_, FragmentNone,
+        static_cast<NGFragmentationType>(fragmentation_type_), is_new_fc_);
+  } else {

[Gleb Lanbin, 2016/10/25 17:37:27]

you don't need 'else' here.

+    return new NGPhysicalConstraintSpace(
+        container_size, fixed_block_, fixed_inline_,
+        block_direction_triggers_scrollbar_,
+        inline_direction_triggers_scrollbar_,
+        static_cast<NGFragmentationType>(fragmentation_type_), FragmentNone,
+        is_new_fc_);
+  }
+}
+
+}  // namespace blink