Devtools[LayoutEditor]: Pass data about property change from InspectorOverlayPage

Source/core/inspector/InspectorOverlay.h

Index: Source/core/inspector/InspectorOverlay.h
diff --git a/Source/core/inspector/InspectorOverlay.h b/Source/core/inspector/InspectorOverlay.h
index bbb18a2e858f084ae7cbba54eeff7739ca052a2a..c6d9a598ccd4eb808c71a909eb8cb1f62847cca4 100644
--- a/Source/core/inspector/InspectorOverlay.h
+++ b/Source/core/inspector/InspectorOverlay.h
@@ -37,6 +37,7 @@
 
 namespace blink {
 
+class InspectorCSSAgent;
 struct InspectorHighlightConfig;
 
 class InspectorOverlay : public WillBeGarbageCollectedMixin {
@@ -53,6 +54,7 @@ public:
     virtual void suspendUpdates() = 0;
     virtual void resumeUpdates() = 0;
     virtual void clear() = 0;
+    virtual void setCSSAgent(InspectorCSSAgent*) = 0;
 
     DEFINE_INLINE_VIRTUAL_TRACE() { }