fix: layout before returning DOM.getContentQuads

Author: Joel Einbinder

Source/WebCore/inspector/agents/InspectorDOMAgent.cpp

@@ -1612,6 +1612,10 @@ void InspectorDOMAgent::getContentQuads(ErrorString& errorString, const String&
         errorString = "Node doesn't have renderer"_s;
         return;
     }
+
+    // Ensure quads are up to date.
+    renderer->document().updateLayoutIgnorePendingStylesheets();
+
     Frame* containingFrame = renderer->document().frame();
     FrameView* containingView = containingFrame ? containingFrame->view() : nullptr;
     if (!containingView) {