Create a unified UIElement interface for Widget, View and Window.

ash/devtools/view_element.h

Index: ash/devtools/view_element.h
diff --git a/ash/devtools/view_element.h b/ash/devtools/view_element.h
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+// 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_VIEW_ELEMENT_H_
+#define ASH_DEVTOOLS_VIEW_ELEMENT_H_
+
+#include "ash/ash_export.h"
+#include "ash/devtools/ui_element.h"
+#include "base/macros.h"
+#include "ui/aura/window.h"
+#include "ui/gfx/geometry/rect.h"
+#include "ui/views/view.h"
+#include "ui/views/view_observer.h"
+
+namespace ash {
+namespace devtools {
+
+class UIElementDelegate;
+
+class ASH_EXPORT ViewElement : public views::ViewObserver, public UIElement {
+ public:
+  ViewElement(views::View* view,
+              UIElementDelegate* ui_element_delegate,
+              UIElement* parent);
+  ~ViewElement() override;
+  views::View* view() const;
+
+  // views::ViewObserver
+  void OnChildViewRemoved(views::View* parent, views::View* view) override;
+  void OnChildViewAdded(views::View* parent, views::View* view) override;
+  void OnChildViewReordered(views::View* parent, views::View*) override;
+  void OnViewBoundsChanged(views::View* view) override;
+
+  // UIElement:
+  void Destroy() override;
+  void GetBounds(gfx::Rect* bounds) const override;
+  void SetBounds(const gfx::Rect& bounds) override;
+  void GetVisible(bool* visible) const override;
+  void SetVisible(bool visible) override;
+  std::pair<aura::Window*, gfx::Rect> GetNodeWindowAndBounds() const override;
+  static views::View* From(UIElement* element);
+
+ private:
+  views::View* view_;
+
+  DISALLOW_COPY_AND_ASSIGN(ViewElement);
+};
+
+}  // namespace devtools
+}  // namespace ash
+
+#endif  // ASH_DEVTOOLS_VIEW_ELEMENT_H_