[ Do not submit ] Prototype for invalidation analysis

Source/core/inspector/InspectorTraceEvents.cpp

Index: Source/core/inspector/InspectorTraceEvents.cpp
diff --git a/Source/core/inspector/InspectorTraceEvents.cpp b/Source/core/inspector/InspectorTraceEvents.cpp
index efa66df4ba0e0292bf335bf5b7cca04896f62fb0..7714c19a68f5ae8419029dde13ff2973334b3e2a 100644
--- a/Source/core/inspector/InspectorTraceEvents.cpp
+++ b/Source/core/inspector/InspectorTraceEvents.cpp
@@ -109,6 +109,39 @@ PassRefPtr<TraceEvent::ConvertableToTraceFormat> InspectorLayoutEvent::endData(R
     return value;
 }
 
+PassRefPtr<TraceEvent::ConvertableToTraceFormat> InspectorStyleInvalidationTrackingEvent::data(Node* node)
+{
+    ASSERT(node);
+    RefPtr<TracedValue> value = TracedValue::create();
+    value->setString("frame", toHexString(node->document().frame()));
+    value->setString("nodeName", node->debugName());
+    value->setInteger("nodeId", InspectorNodeIds::idForNode(node));
+    RefPtr<ScriptCallStack> callstack = createScriptCallStack(5, true);
+    value->setString("callstack", callstack ? callstack->buildInspectorArray()->toJSONString() : "[]");
+    return value;
+}
+
+PassRefPtr<TraceEvent::ConvertableToTraceFormat> InspectorLayoutInvalidationTrackingEvent::data(RenderObject* renderer)
+{
+    ASSERT(renderer);
+    RefPtr<TracedValue> value = TracedValue::create();
+    value->setString("frame", toHexString(renderer->frame()));
+    setGeneratingNodeId(value.get(), "nodeId", renderer);

[caseq, 2014/08/26 12:19:07]

can we just use the node id of the generating node here?

+    RefPtr<ScriptCallStack> callstack = createScriptCallStack(5, true);
+    value->setString("callstack", callstack ? callstack->buildInspectorArray()->toJSONString() : "[]");

[caseq, 2014/08/26 12:19:07]

we normally expose callstacks via a separate event adjacent to the "payload"
instrumentation event. The reason for that is that they're in a category of
their own, so we may control the instrumentation overhead by toggling checkbox
in the Timeline UI (stack collection is relatively expensive).

+    return value;
+}
+
+PassRefPtr<TraceEvent::ConvertableToTraceFormat> InspectorPaintInvalidationTrackingEvent::data(RenderObject* renderer)
+{
+    ASSERT(renderer);
+    RefPtr<TracedValue> value = TracedValue::create();
+
+    value->setString("frame", toHexString(renderer->frame()));
+    setGeneratingNodeId(value.get(), "nodeId", renderer);

[caseq, 2014/08/26 12:19:07]

ditto.

+    return value;
+}
+
 PassRefPtr<TraceEvent::ConvertableToTraceFormat> InspectorSendRequestEvent::data(unsigned long identifier, LocalFrame* frame, const ResourceRequest& request)
 {
     String requestId = IdentifiersFactory::requestId(identifier);