Add CSS agent for various window/widget/view attributes in devtools

ash/common/devtools/ash_devtools_dom_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_DOM_AGENT_H_
 #define ASH_COMMON_DEVTOOLS_ASH_DEVTOOLS_DOM_AGENT_H_
 
 #include "ash/common/wm_shell.h"
 #include "ash/common/wm_window_observer.h"
 #include "base/compiler_specific.h"
 #include "components/ui_devtools/DOM.h"
 #include "components/ui_devtools/devtools_base_agent.h"
+#include "ui/views/view.h"
+#include "ui/views/widget/widget.h"
 
 namespace ash {
 namespace devtools {
 
 class ASH_EXPORT AshDevToolsDOMAgent
     : public NON_EXPORTED_BASE(ui::devtools::UiDevToolsBaseAgent<
                                ui::devtools::protocol::DOM::Metainfo>),
       public WmWindowObserver {
  public:
   explicit AshDevToolsDOMAgent(ash::WmShell* shell);
   ~AshDevToolsDOMAgent() override;
 
   // DOM::Backend
   ui::devtools::protocol::Response disable() override;
   ui::devtools::protocol::Response getDocument(
       std::unique_ptr<ui::devtools::protocol::DOM::Node>* out_root) override;
 
   // WindowObserver
   void OnWindowTreeChanging(WmWindow* window,
                             const TreeChangeParams& params) override;
   void OnWindowTreeChanged(WmWindow* window,
                            const TreeChangeParams& params) override;
   void OnWindowStackingChanged(WmWindow* window) override;
 
+  WmWindow* GetWindowFromNodeId(int nodeId);
+  views::Widget* GetWidgetFromNodeId(int nodeId);
+  views::View* GetViewFromNodeId(int nodeId);
+
  private:
+  std::unique_ptr<ui::devtools::protocol::DOM::Node> BuildTreeForView(
+      views::View* view);
+  std::unique_ptr<ui::devtools::protocol::DOM::Node> BuildTreeForRootWidget(
+      views::Widget* widget);
   std::unique_ptr<ui::devtools::protocol::DOM::Node> BuildTreeForWindow(
       WmWindow* window);
   std::unique_ptr<ui::devtools::protocol::DOM::Node> BuildInitialTree();
   void AddWindowNode(WmWindow* window);
   void RemoveWindowNode(WmWindow* window, WmWindow* old_parent);
   void RemoveObserverFromAllWindows();
   void AddRootWindowObservers();
   void Reset();
 
   ash::WmShell* shell_;
 
   using WindowToNodeIdMap = std::unordered_map<WmWindow*, int>;
   WindowToNodeIdMap window_to_node_id_map_;
 
+  std::unordered_map<int, WmWindow*> node_id_to_window_map_;
+  std::unordered_map<int, views::Widget*> node_id_to_widget_map_;
+  std::unordered_map<int, views::View*> node_id_to_view_map_;
+
   DISALLOW_COPY_AND_ASSIGN(AshDevToolsDOMAgent);
 };
 
 }  // namespace devtools
 }  // namespace ash
 
 #endif  // ASH_COMMON_DEVTOOLS_ASH_DEVTOOLS_DOM_AGENT_H_