[Invalidation Tracking] add TraceEvents for setNeedsStyleRecalc.

Source/core/inspector/InspectorTraceEvents.h

Index: Source/core/inspector/InspectorTraceEvents.h
diff --git a/Source/core/inspector/InspectorTraceEvents.h b/Source/core/inspector/InspectorTraceEvents.h
index 24ffa7165b1b645695ea0218bd59f291906ed4e1..6abfe8040e0a21b386552fca4be3a16552da315a 100644
--- a/Source/core/inspector/InspectorTraceEvents.h
+++ b/Source/core/inspector/InspectorTraceEvents.h
@@ -20,16 +20,23 @@ class GraphicsLayer;
 class KURL;
 class LayoutRect;
 class LocalFrame;
+class Node;
 class RenderImage;
 class RenderLayer;
 class RenderObject;
 class ResourceRequest;
 class ResourceResponse;
-class ScriptSourceCode;
 class ScriptCallStack;
+class ScriptSourceCode;
+class StyleChangeReasonForTracing;
 class WorkerThread;
 class XMLHttpRequest;
 
+class InspectorStyleRecalcInvalidationTrackingEvent {
+public:
+    static PassRefPtr<TraceEvent::ConvertableToTraceFormat> data(Node*, const StyleChangeReasonForTracing&);
+};
+
 class InspectorLayoutEvent {
 public:
     static PassRefPtr<TraceEvent::ConvertableToTraceFormat> beginData(FrameView*);