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

Source/core/inspector/InspectorCSSAgent.cpp

 /*
  * Copyright (C) 2010, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in the
@@ skipping 1499 matching lines @@
         Element* element = toElement(m_domAgent->nodeForId(state.key));
         if (element && element->ownerDocument())
             documentsToChange.add(element->ownerDocument());
     }
 
     m_nodeIdToForcedPseudoState.clear();
     for (auto& document : documentsToChange)
         document->setNeedsStyleRecalc(SubtreeStyleChange, StyleChangeReasonForTracing::create(StyleChangeReason::Inspector));
 }
 
+void InspectorCSSAgent::setCSSPropertyValue(Node* node, CSSPropertyID propertyId, float newValue)
+{
+    Element* element = toElement(node);
+    if (element) {
+        TrackExceptionState exceptionState;
+        String newText = getPropertyNameString(propertyId) +  " : " + String::number(newValue) + "px";
+        element->style()->setCSSText(newText, exceptionState);
+    }
+}
+
 DEFINE_TRACE(InspectorCSSAgent)
 {
     visitor->trace(m_domAgent);
     visitor->trace(m_pageAgent);
     visitor->trace(m_resourceAgent);
 #if ENABLE(OILPAN)
     visitor->trace(m_idToInspectorStyleSheet);
     visitor->trace(m_idToInspectorStyleSheetForInlineStyle);
     visitor->trace(m_cssStyleSheetToInspectorStyleSheet);
     visitor->trace(m_documentToCSSStyleSheets);
     visitor->trace(m_invalidatedDocuments);
     visitor->trace(m_nodeToInspectorStyleSheet);
     visitor->trace(m_documentToViaInspectorStyleSheet);
 #endif
     visitor->trace(m_inspectorUserAgentStyleSheet);
     InspectorBaseAgent::trace(visitor);
 }
 
 } // namespace blink