Show corresponding window/widget/view in UIElement tree when clicking on a UI element.

components/ui_devtools/views/ui_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 COMPONENTS_UI_DEVTOOLS_VIEWS_UI_DEVTOOLS_DOM_AGENT_H_
 #define COMPONENTS_UI_DEVTOOLS_VIEWS_UI_DEVTOOLS_DOM_AGENT_H_
 
 #include "components/ui_devtools/DOM.h"
+#include "components/ui_devtools/Overlay.h"
 #include "components/ui_devtools/devtools_base_agent.h"
 #include "components/ui_devtools/views/ui_element_delegate.h"
 #include "ui/aura/env_observer.h"
 #include "ui/views/view.h"
 #include "ui/views/widget/widget.h"
 
 namespace aura {
 class Window;
 }
 
@@ skipping 12 matching lines @@
                            public UIElementDelegate,
                            public aura::EnvObserver {
  public:
   UIDevToolsDOMAgent();
   ~UIDevToolsDOMAgent() 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;
+  ui_devtools::protocol::Response pushNodesByBackendIdsToFrontend(
+      std::unique_ptr<protocol::Array<int>> backend_node_ids,
+      std::unique_ptr<protocol::Array<int>>* result) override;
+  ui_devtools::protocol::Response setInspectedNode(int node_id) 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;
 
   void AddObserver(UIDevToolsDOMAgentObserver* observer);
   void RemoveObserver(UIDevToolsDOMAgentObserver* 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_;
   };
+  ui_devtools::protocol::Response HighlightNode(
+      std::unique_ptr<ui_devtools::protocol::Overlay::HighlightConfig>
+          highlight_config,
+      int node_id);
+  void FindElementByEventHandler(const gfx::Point& p, int* element_id);
 
  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);
-  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<ui::Layer> layer_for_highlighting_;
   std::vector<aura::Window*> root_windows_;
   base::ObserverList<UIDevToolsDOMAgentObserver> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(UIDevToolsDOMAgent);
 };
 
 }  // namespace ui_devtools
 
 #endif  // COMPONENTS_UI_DEVTOOLS_VIEWS_UI_DEVTOOLS_DOM_AGENT_H_