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

ash/common/devtools/ash_devtools_css_agent.h

 // Copyright 2016 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_COMMON_DEVTOOLS_ASH_DEVTOOLS_CSS_AGENT_H_
 #define ASH_COMMON_DEVTOOLS_ASH_DEVTOOLS_CSS_AGENT_H_
 
+#include "ash/ash_export.h"
 #include "ash/common/devtools/ash_devtools_dom_agent.h"
+#include "ash/common/devtools/ui_element.h"
 #include "components/ui_devtools/CSS.h"
 #include "ui/views/widget/widget_observer.h"
 
 namespace ash {
 namespace devtools {
 
 class ASH_EXPORT AshDevToolsCSSAgent
     : public NON_EXPORTED_BASE(ui::devtools::UiDevToolsBaseAgent<
                                ui::devtools::protocol::CSS::Metainfo>),
       public AshDevToolsDOMAgentObserver {
  public:
   explicit AshDevToolsCSSAgent(AshDevToolsDOMAgent* dom_agent);
   ~AshDevToolsCSSAgent() override;
 
   // CSS::Backend
   ui::devtools::protocol::Response enable() override;
   ui::devtools::protocol::Response disable() override;
   ui::devtools::protocol::Response getMatchedStylesForNode(
       int node_id,
       ui::devtools::protocol::Maybe<ui::devtools::protocol::CSS::CSSStyle>*
           inline_style) override;
   ui::devtools::protocol::Response setStyleTexts(
       std::unique_ptr<ui::devtools::protocol::Array<
           ui::devtools::protocol::CSS::StyleDeclarationEdit>> edits,
       std::unique_ptr<
           ui::devtools::protocol::Array<ui::devtools::protocol::CSS::CSSStyle>>*
           result) override;
 
   // AshDevToolsDOMAgentObserver
-  void OnWindowBoundsChanged(WmWindow* window) override;
-  void OnWidgetBoundsChanged(views::Widget* widget) override;
-  void OnViewBoundsChanged(views::View* view) override;
+  void OnUIElementBoundsChanged(UIElement* ui_element) override;
 
  private:
   std::unique_ptr<ui::devtools::protocol::CSS::CSSStyle> GetStylesForNode(
       int node_id);
   void InvalidateStyleSheet(int node_id);
   bool GetPropertiesForNodeId(int node_id, gfx::Rect* bounds, bool* visible);
   bool SetPropertiesForNodeId(int node_id,
                               const gfx::Rect& bounds,
                               bool visible);
   AshDevToolsDOMAgent* dom_agent_;
 
   DISALLOW_COPY_AND_ASSIGN(AshDevToolsCSSAgent);
 };
 
 }  // namespace devtools
 }  // namespace ash
 
 #endif  // ASH_COMMON_DEVTOOLS_ASH_DEVTOOLS_CSS_AGENT_H_