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

components/ui_devtools/devtools/view_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_VIEW_ELEMENT_H_
-#define ASH_DEVTOOLS_VIEW_ELEMENT_H_
+#ifndef COMPONENTS_UI_DEVTOOLS_DEVTOOLS_VIEW_ELEMENT_H_
+#define COMPONENTS_UI_DEVTOOLS_DEVTOOLS_VIEW_ELEMENT_H_
 
-#include "ash/ash_export.h"
-#include "ash/devtools/ui_element.h"
 #include "base/macros.h"
+#include "components/ui_devtools/devtools/ui_element.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 ui {
 namespace devtools {
 
 class UIElementDelegate;
 
-class ASH_EXPORT ViewElement : public views::ViewObserver, public UIElement {
+class ViewElement : public views::ViewObserver, public UIElement {
  public:
   ViewElement(views::View* view,
               UIElementDelegate* ui_element_delegate,
               UIElement* parent);
   ~ViewElement() override;
   views::View* view() const { return view_; };
 
   // 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 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
+}  // namespace ui
 
-#endif  // ASH_DEVTOOLS_VIEW_ELEMENT_H_
+#endif  // COMPONENTS_UI_DEVTOOLS_DEVTOOLS_VIEW_ELEMENT_H_