Remove ash dependency.

ash/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_DEVTOOLS_ASH_DEVTOOLS_DOM_AGENT_H_
 #define ASH_DEVTOOLS_ASH_DEVTOOLS_DOM_AGENT_H_
 
 #include "ash/ash_export.h"
 #include "ash/devtools/ui_element_delegate.h"
 #include "base/macros.h"
 #include "components/ui_devtools/DOM.h"
 #include "components/ui_devtools/devtools_base_agent.h"
+#include "ui/aura/env_observer.h"
 #include "ui/views/view.h"
 #include "ui/views/widget/widget.h"
 
 namespace aura {
 class Window;
 }
 
 namespace ash {
 namespace devtools {
 
 class UIElement;
 
 class ASH_EXPORT AshDevToolsDOMAgentObserver {
  public:
   // TODO(thanhph): Use UIElement* as input argument instead.
   virtual void OnNodeBoundsChanged(int node_id) = 0;
 };
 
 class ASH_EXPORT AshDevToolsDOMAgent
     : public NON_EXPORTED_BASE(ui::devtools::UiDevToolsBaseAgent<
                                ui::devtools::protocol::DOM::Metainfo>),
-      public UIElementDelegate {
+      public UIElementDelegate,
+      public aura::EnvObserver {
  public:
   AshDevToolsDOMAgent();
   ~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;
   ui::devtools::protocol::Response highlightNode(
       std::unique_ptr<ui::devtools::protocol::DOM::HighlightConfig>
           highlight_config,
       ui::devtools::protocol::Maybe<int> node_id) override;
   ui::devtools::protocol::Response hideHighlight() override;
 
   // UIElementDelegate:
   void OnUIElementAdded(UIElement* parent, UIElement* child) override;
   void OnUIElementReordered(UIElement* parent, UIElement* child) override;
   void OnUIElementRemoved(UIElement* ui_element) override;
   void OnUIElementBoundsChanged(UIElement* ui_element) override;
   bool IsHighlightingWindow(aura::Window* window) override;
 
   void AddObserver(AshDevToolsDOMAgentObserver* observer);
   void RemoveObserver(AshDevToolsDOMAgentObserver* observer);
   UIElement* GetElementFromNodeId(int node_id);
   UIElement* window_element_root() const { return window_element_root_.get(); };
+  const std::vector<aura::Window*>& root_windows() const {
+    return root_windows_;
+  };
 
  private:
+  // aura::EnvObserver:
+  void OnWindowInitialized(aura::Window* window) override {}
+  void OnHostInitialized(aura::WindowTreeHost* host) override;
+
   void OnNodeBoundsChanged(int node_id);
-
   std::unique_ptr<ui::devtools::protocol::DOM::Node> BuildInitialTree();
   std::unique_ptr<ui::devtools::protocol::DOM::Node> BuildTreeForUIElement(
       UIElement* ui_element);
   std::unique_ptr<ui::devtools::protocol::DOM::Node> BuildTreeForWindow(
       UIElement* window_element_root,
       aura::Window* window);
   std::unique_ptr<ui::devtools::protocol::DOM::Node> BuildTreeForRootWidget(
       UIElement* widget_element,
       views::Widget* widget);
   std::unique_ptr<ui::devtools::protocol::DOM::Node> BuildTreeForView(
       UIElement* view_element,
       views::View* view);
   void RemoveDomNode(UIElement* ui_element);
   void Reset();
   void InitializeHighlightingWidget();
   void UpdateHighlight(
       const std::pair<aura::Window*, gfx::Rect>& window_and_bounds,
       SkColor background,
       SkColor border);
   ui::devtools::protocol::Response HighlightNode(
       std::unique_ptr<ui::devtools::protocol::DOM::HighlightConfig>
           highlight_config,
       int node_id);
 
   bool is_building_tree_;
   std::unique_ptr<UIElement> window_element_root_;
   std::unordered_map<int, UIElement*> node_id_to_ui_element_;
   std::unique_ptr<views::Widget> widget_for_highlighting_;
+  std::vector<aura::Window*> root_windows_;
   base::ObserverList<AshDevToolsDOMAgentObserver> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(AshDevToolsDOMAgent);
 };
 
 }  // namespace devtools
 }  // namespace ash
 
 #endif  // ASH_DEVTOOLS_ASH_DEVTOOLS_DOM_AGENT_H_