Devtools[LayoutEditor]: Rework layout-editor workflow

Source/web/InspectorOverlayImpl.h

Index: Source/web/InspectorOverlayImpl.h
diff --git a/Source/web/InspectorOverlayImpl.h b/Source/web/InspectorOverlayImpl.h
index 19bbab82f3717552b70b1ce33545401cb3720cc2..5765a176b97d5fc8d1f71b6cd9e389997ff37af9 100644
--- a/Source/web/InspectorOverlayImpl.h
+++ b/Source/web/InspectorOverlayImpl.h
@@ -79,7 +79,7 @@ public:
     ~InspectorOverlayImpl() override;
     DECLARE_TRACE();
 
-    void init(InspectorCSSAgent*, InspectorDebuggerAgent*);
+    void init(InspectorCSSAgent*, InspectorDebuggerAgent*, InspectorDOMAgent*);
 
     void update();
     void clear();
@@ -98,6 +98,7 @@ private:
     void overlayStartedPropertyChange(const String&) override;
     void overlayPropertyChanged(float) override;
     void overlayEndedPropertyChange() override;
+    void clearSelection(bool) override;
 
     // InspectorProfilerAgent::Client implementation.
     void profilingStarted() override;
@@ -113,6 +114,7 @@ private:
     void hideHighlight() override;
     void highlightNode(Node*, Node* eventTarget, const InspectorHighlightConfig&, bool omitTooltip) override;
     void highlightQuad(PassOwnPtr<FloatQuad>, const InspectorHighlightConfig&) override;
+    void showLayoutEditorForNode(Node*, const InspectorHighlightConfig&) override;
 
     bool isEmpty();
     void drawNodeHighlight();