[Invalidation Tracking] add TraceEvents for setNeedsStyleRecalc.

Source/core/inspector/InspectorTraceEvents.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "core/inspector/InspectorTraceEvents.h"
 
 #include "bindings/core/v8/ScriptCallStackFactory.h"
 #include "bindings/core/v8/ScriptGCEvent.h"
 #include "bindings/core/v8/ScriptSourceCode.h"
+#include "core/dom/StyleChangeReason.h"
 #include "core/events/Event.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
 #include "core/inspector/IdentifiersFactory.h"
 #include "core/inspector/InspectorNodeIds.h"
 #include "core/inspector/ScriptCallStack.h"
 #include "core/page/Page.h"
 #include "core/rendering/RenderImage.h"
 #include "core/rendering/RenderLayer.h"
 #include "core/rendering/RenderObject.h"
@@ skipping 28 matching lines @@
 
 private:
     String m_serialized;
 };
 
 String toHexString(const void* p)
 {
     return String::format("0x%" PRIx64, static_cast<uint64>(reinterpret_cast<intptr_t>(p)));
 }
 
+void setNodeInfo(TracedValue* value, Node* node, const char* idFieldName, const char* nameFieldName = 0)
+{
+    value->setInteger(idFieldName, InspectorNodeIds::idForNode(node));
+    if (nameFieldName)
+        value->setString(nameFieldName, node->debugName());
+}
+
 }
 
+PassRefPtr<TraceEvent::ConvertableToTraceFormat> InspectorStyleRecalcInvalidationTrackingEvent::data(Node* node, const StyleChangeReasonForTracing& reason)
+{
+    ASSERT(node);
+
+    RefPtr<TracedValue> value = TracedValue::create();
+    value->setString("frame", toHexString(node->document().frame()));
+    setNodeInfo(value.get(), node, "nodeId", "nodeName");
+    value->setString("reason", reason.reasonString());
+    value->setString("extraData", reason.extraData());
+    return value.release();
+}
+
 PassRefPtr<TraceEvent::ConvertableToTraceFormat> InspectorLayoutEvent::beginData(FrameView* frameView)
 {
     bool isPartial;
     unsigned needsLayoutObjects;
     unsigned totalObjects;
     LocalFrame& frame = frameView->frame();
     frame.countObjectsNeedingLayout(needsLayoutObjects, totalObjects, isPartial);
 
     RefPtr<TracedValue> value = TracedValue::create();
     value->setInteger("dirtyObjects", needsLayoutObjects);
@@ skipping 17 matching lines @@
     value->endArray();
 }
 
 static void setGeneratingNodeInfo(TracedValue* value, const RenderObject* renderer, const char* idFieldName, const char* nameFieldName = 0)
 {
     Node* node = 0;
     for (; renderer && !node; renderer = renderer->parent())
         node = renderer->generatingNode();
     if (!node)
         return;
-    value->setInteger(idFieldName, InspectorNodeIds::idForNode(node));
-    if (nameFieldName)
-        value->setString(nameFieldName, node->debugName());
+
+    setNodeInfo(value, node, idFieldName, nameFieldName);
 }
 
 PassRefPtr<TraceEvent::ConvertableToTraceFormat> InspectorLayoutEvent::endData(RenderObject* rootForThisLayout)
 {
     Vector<FloatQuad> quads;
     rootForThisLayout->absoluteQuads(quads);
 
     RefPtr<TracedValue> value = TracedValue::create();
     if (quads.size() >= 1) {
         createQuad(value.get(), "root", quads[0]);
@@ skipping 291 matching lines @@
 
 PassRefPtr<TraceEvent::ConvertableToTraceFormat> InspectorTracingSessionIdForWorkerEvent::data(const String& sessionId, WorkerThread* workerThread)
 {
     RefPtr<TracedValue> value = TracedValue::create();
     value->setString("sessionId", sessionId);
     value->setDouble("workerThreadId", workerThread->platformThreadId());
     return value.release();
 }
 
 }