Devtools[LayoutEditor]: Rework layout-editor workflow

Source/core/inspector/InspectorDOMAgent.h

Index: Source/core/inspector/InspectorDOMAgent.h
diff --git a/Source/core/inspector/InspectorDOMAgent.h b/Source/core/inspector/InspectorDOMAgent.h
index b2a2bcfb271985872668e1b00f423759b39bc6c5..ad90fd631dd05e5dfd7630b654c00c5a794378d9 100644
--- a/Source/core/inspector/InspectorDOMAgent.h
+++ b/Source/core/inspector/InspectorDOMAgent.h
@@ -123,7 +123,7 @@ public:
     void discardSearchResults(ErrorString*, const String& searchId) override;
     void resolveNode(ErrorString*, int nodeId, const String* objectGroup, RefPtr<TypeBuilder::Runtime::RemoteObject>& result) override;
     void getAttributes(ErrorString*, int nodeId, RefPtr<TypeBuilder::Array<String>>& result) override;
-    void setInspectModeEnabled(ErrorString*, bool enabled, const bool* inspectUAShadowDOM, const RefPtr<JSONObject>* highlightConfig) override;
+    void setInspectModeEnabled(ErrorString*, bool enabled, const String* mode, const RefPtr<JSONObject>* highlightConfig) override;
     void requestNode(ErrorString*, const String& objectId, int* nodeId) override;
     void pushNodeByPathToFrontend(ErrorString*, const String& path, int* nodeId) override;
     void pushNodesByBackendIdsToFrontend(ErrorString*, const RefPtr<JSONArray>& nodeIds, RefPtr<TypeBuilder::Array<int>>&) override;
@@ -182,6 +182,8 @@ public:
 
     InspectorHistory* history() { return m_history.get(); }
 
+    void resumeSearchingForNode(Node*);
+
     // We represent embedded doms as a part of the same hierarchy. Hence we treat children of frame owners differently.
     // We also skip whitespace text nodes conditionally. Following methods encapsulate these specifics.
     static Node* innerFirstChild(Node*);
@@ -196,7 +198,7 @@ public:
     Document* assertDocument(ErrorString*, int nodeId);
 
 private:
-    enum SearchMode { NotSearching, SearchingForNormal, SearchingForUAShadow };
+    enum SearchMode { NotSearching, SearchingForNormal, SearchingForUAShadow, SearchingInLayoutEditor };
 
     InspectorDOMAgent(InspectorPageAgent*, InjectedScriptManager*, InspectorOverlay*);
 
@@ -262,6 +264,7 @@ private:
     OwnPtrWillBeMember<DOMEditor> m_domEditor;
     bool m_suppressAttributeModifiedEvent;
     int m_backendNodeIdToInspect;
+    bool m_layoutEditorEnabled;
 };