Move DevTools out of ash and turn it to a component.

ash/devtools/ui_element.h

-// 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.
-
-#ifndef ASH_DEVTOOLS_UI_ELEMENT_H_
-#define ASH_DEVTOOLS_UI_ELEMENT_H_
-
-#include <vector>
-
-#include "ash/ash_export.h"
-#include "base/macros.h"
-#include "ui/aura/window.h"
-#include "ui/gfx/geometry/rect.h"
-#include "ui/views/view.h"
-
-namespace ash {
-namespace devtools {
-
-class UIElementDelegate;
-
-// UIElement type.
-enum UIElementType { WINDOW, WIDGET, VIEW };
-
-class ASH_EXPORT UIElement {
- public:
-  virtual ~UIElement();
-  int node_id() const { return node_id_; };
-  std::string GetTypeName() const;
-  UIElement* parent() const { return parent_; };
-  UIElementDelegate* delegate() const { return delegate_; };
-  UIElementType type() const { return type_; };
-  const std::vector<UIElement*>& children() const { return children_; };
-
-  // |child| is inserted in front of |before|. If |before| is null, it
-  // is inserted at the end. Parent takes ownership of the added child.
-  void AddChild(UIElement* child, UIElement* before = nullptr);
-
-  // Remove |child| out of vector |children_| but |child| is not destroyed.
-  // The caller is responsible for destroying |child|.
-  void RemoveChild(UIElement* child);
-
-  // Move |child| to position new_index in |children_|.
-  void ReorderChild(UIElement* child, int new_index);
-
-  virtual void GetBounds(gfx::Rect* bounds) const = 0;
-  virtual void SetBounds(const gfx::Rect& bounds) = 0;
-  virtual void GetVisible(bool* visible) const = 0;
-  virtual void SetVisible(bool visible) = 0;
-
-  // If element exists, return its associated native window and its bounds.
-  // Otherwise, return null and empty bounds.
-  virtual std::pair<aura::Window*, gfx::Rect> GetNodeWindowAndBounds()
-      const = 0;
-
-  template <typename BackingT, typename T>
-  static BackingT* GetBackingElement(UIElement* element) {
-    return T::From(element);
-  };
-
- protected:
-  UIElement(const UIElementType type,
-            UIElementDelegate* delegate,
-            UIElement* parent);
-
- private:
-  const int node_id_;
-  const UIElementType type_;
-  std::vector<UIElement*> children_;
-  UIElement* parent_;
-  UIElementDelegate* delegate_;
-
-  DISALLOW_COPY_AND_ASSIGN(UIElement);
-};
-
-}  // namespace devtools
-}  // namespace ash
-
-#endif  // ASH_DEVTOOLS_UI_ELEMENT_H_