Media Controls: move volume slider to modules/.

third_party/WebKit/Source/core/layout/api/LayoutSliderItem.cpp

+// 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/api/LayoutSliderItem.h"
+
+#include "core/layout/LayoutSlider.h"
+
+namespace blink {
+
+LayoutSliderItem::LayoutSliderItem(LayoutSlider* layout_slider)
+    : LayoutBlockItem(layout_slider) {}
+
+LayoutSliderItem::LayoutSliderItem(const LayoutBlockItem& item)
+    : LayoutBlockItem(item) {
+  SECURITY_DCHECK(!item || item.IsSlider());
+}
+
+LayoutSliderItem::LayoutSliderItem(std::nullptr_t) : LayoutBlockItem(nullptr) {}
+
+LayoutSliderItem::LayoutSliderItem() = default;
+
+bool LayoutSliderItem::InDragMode() const {
+  return ToSlider()->InDragMode();
+}
+
+LayoutSlider* LayoutSliderItem::ToSlider() {
+  return ToLayoutSlider(GetLayoutObject());
+}
+
+const LayoutSlider* LayoutSliderItem::ToSlider() const {
+  return ToLayoutSlider(GetLayoutObject());
+}
+
+}  // namespace blink