TextControl NG: Add skeletons of LayoutNGTextControl* classes

This CL adds Layout NG classes corresponding to
blink::LayoutTextControlInnerEditor, blink::LayoutTextControlMultiLine,
and blink::LayoutTextControlSingleLine.

- LayoutNGTextControlInnerEditor doesn't need IsOfType().
- LayoutNGTextControl*Line should create new formatting context.

This CL has no behavior changes.  The new classes are not used yet.

Bug: 1040826
Change-Id: If7d30d07ab7cf66bfa4e207b8ce99a4ba4cc3662
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2440228
Auto-Submit: Kent Tamura <tkent@chromium.org>
Commit-Queue: Koji Ishii <kojii@chromium.org>
Reviewed-by: Koji Ishii <kojii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812540}

third_party/blink/renderer/core/layout/BUILD.gn

@@ -437,6 +437,11 @@ blink_core_sources("layout") {
     "ng/layout_ng_ruby_run.h",
     "ng/layout_ng_ruby_text.cc",
     "ng/layout_ng_ruby_text.h",
+    "ng/layout_ng_text_control_inner_editor.h",
+    "ng/layout_ng_text_control_multi_line.cc",
+    "ng/layout_ng_text_control_multi_line.h",
+    "ng/layout_ng_text_control_single_line.cc",
+    "ng/layout_ng_text_control_single_line.h",
     "ng/legacy_layout_tree_walking.h",
     "ng/list/layout_ng_inside_list_marker.cc",
     "ng/list/layout_ng_inside_list_marker.h",

third_party/blink/renderer/core/layout/layout_object.h

@@ -3279,6 +3279,8 @@ class CORE_EXPORT LayoutObject : public ImageResourceObserver,
     kLayoutObjectNGOutsideListMarker,
     kLayoutObjectNGProgress,
     kLayoutObjectNGText,
+    kLayoutObjectNGTextControlMultiLine,
+    kLayoutObjectNGTextControlSingleLine,
     kLayoutObjectOutsideListMarker,
     kLayoutObjectProgress,
     kLayoutObjectQuote,

third_party/blink/renderer/core/layout/ng/layout_ng_text_control_inner_editor.h

+// Copyright 2020 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 THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_NG_LAYOUT_NG_TEXT_CONTROL_INNER_EDITOR_H_
+#define THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_NG_LAYOUT_NG_TEXT_CONTROL_INNER_EDITOR_H_
+
+#include "third_party/blink/renderer/core/layout/ng/layout_ng_block_flow.h"
+
+namespace blink {
+
+// LayoutNGTextControlInnerEditor is a LayoutObject for 'InnerEditor' elements
+// in <input> and <textarea>.
+class LayoutNGTextControlInnerEditor final : public LayoutNGBlockFlow {
+ public:
+  explicit LayoutNGTextControlInnerEditor(Element* element)
+      : LayoutNGBlockFlow(element) {}
+
+  const char* GetName() const override {
+    NOT_DESTROYED();
+    return "LayoutNGTextControlInnerEditor";
+  }
+};
+
+}  // namespace blink
+
+#endif  // THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_NG_LAYOUT_NG_TEXT_CONTROL_INNER_EDITOR_H_

third_party/blink/renderer/core/layout/ng/layout_ng_text_control_multi_line.cc

+// Copyright 2020 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 "third_party/blink/renderer/core/layout/ng/layout_ng_text_control_multi_line.h"
+
+namespace blink {
+
+LayoutNGTextControlMultiLine::LayoutNGTextControlMultiLine(Element* element)
+    : LayoutNGBlockFlow(element) {}
+
+bool LayoutNGTextControlMultiLine::IsOfType(LayoutObjectType type) const {
+  return type == kLayoutObjectNGTextControlMultiLine ||
+         LayoutNGBlockFlow::IsOfType(type);
+}
+
+}  // namespace blink

third_party/blink/renderer/core/layout/ng/layout_ng_text_control_multi_line.h

+// Copyright 2020 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 THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_NG_LAYOUT_NG_TEXT_CONTROL_MULTI_LINE_H_
+#define THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_NG_LAYOUT_NG_TEXT_CONTROL_MULTI_LINE_H_
+
+#include "third_party/blink/renderer/core/layout/ng/layout_ng_block_flow.h"
+
+namespace blink {
+
+// LayoutNGTextControlSingleLine is a LayoutObject for <textarea>.
+class LayoutNGTextControlMultiLine final : public LayoutNGBlockFlow {
+ public:
+  explicit LayoutNGTextControlMultiLine(Element* element);
+
+ private:
+  bool IsOfType(LayoutObjectType) const override;
+
+  const char* GetName() const override {
+    NOT_DESTROYED();
+    return "LayoutNGTextControlMultiLine";
+  }
+
+  bool CreatesNewFormattingContext() const override {
+    NOT_DESTROYED();
+    return true;
+  }
+};
+
+}  // namespace blink
+
+#endif  // THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_NG_LAYOUT_NG_TEXT_CONTROL_MULTI_LINE_H_

third_party/blink/renderer/core/layout/ng/layout_ng_text_control_single_line.cc

+// Copyright 2020 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 "third_party/blink/renderer/core/layout/ng/layout_ng_text_control_single_line.h"
+
+namespace blink {
+
+LayoutNGTextControlSingleLine::LayoutNGTextControlSingleLine(Element* element)
+    : LayoutNGBlockFlow(element) {}
+
+bool LayoutNGTextControlSingleLine::IsOfType(LayoutObjectType type) const {
+  return type == kLayoutObjectNGTextControlSingleLine ||
+         LayoutNGBlockFlow::IsOfType(type);
+}
+
+}  // namespace blink

third_party/blink/renderer/core/layout/ng/layout_ng_text_control_single_line.h

+// Copyright 2020 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 THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_NG_LAYOUT_NG_TEXT_CONTROL_SINGLE_LINE_H_
+#define THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_NG_LAYOUT_NG_TEXT_CONTROL_SINGLE_LINE_H_
+
+#include "third_party/blink/renderer/core/layout/ng/layout_ng_block_flow.h"
+
+namespace blink {
+
+// LayoutNGTextControlSingleLine is a LayoutObject for textfield <input>.
+class LayoutNGTextControlSingleLine final : public LayoutNGBlockFlow {
+ public:
+  explicit LayoutNGTextControlSingleLine(Element* element);
+
+ private:
+  bool IsOfType(LayoutObjectType) const override;
+
+  const char* GetName() const override {
+    NOT_DESTROYED();
+    return "LayoutNGTextControlSingleLine";
+  }
+
+  bool CreatesNewFormattingContext() const override {
+    NOT_DESTROYED();
+    return true;
+  }
+};
+
+}  // namespace blink
+
+#endif  // THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_NG_LAYOUT_NG_TEXT_CONTROL_SINGLE_LINE_H_