Devtools [LayoutEditor]: show selector info and highlight affected nodes

Source/core/inspector/InspectorOverlayHost.cpp

Index: Source/core/inspector/InspectorOverlayHost.cpp
diff --git a/Source/core/inspector/InspectorOverlayHost.cpp b/Source/core/inspector/InspectorOverlayHost.cpp
index 786d20aff7bd39aa855248dca6e2e53c115cbb29..a03a82d788b6d4c62f453c4faa395204e8553517 100644
--- a/Source/core/inspector/InspectorOverlayHost.cpp
+++ b/Source/core/inspector/InspectorOverlayHost.cpp
@@ -77,6 +77,26 @@ void InspectorOverlayHost::clearSelection(bool commitChanges)
         m_listener->overlayClearSelection(commitChanges);
 }
 
+void InspectorOverlayHost::nextSelector()
+{
+    if (m_listener)
+        m_listener->overlayNextSelector();
+}
+
+void InspectorOverlayHost::previousSelector()
+{
+    if (m_listener)
+        m_listener->overlayPreviousSelector();
+}
+
+String InspectorOverlayHost::currentSelectorInfo()
+{
+    if (m_listener)
+        return m_listener->overlayCurrentSelectorInfo();
+
+    return String();
+}
+
 DEFINE_TRACE(InspectorOverlayHost)
 {
     visitor->trace(m_listener);