DevTools: simplify the async instrumentation harness.

third_party/WebKit/Source/core/xmlhttprequest/XMLHttpRequest.cpp

Index: third_party/WebKit/Source/core/xmlhttprequest/XMLHttpRequest.cpp
diff --git a/third_party/WebKit/Source/core/xmlhttprequest/XMLHttpRequest.cpp b/third_party/WebKit/Source/core/xmlhttprequest/XMLHttpRequest.cpp
index b9c76dd76e404045ad5b0494f5744decc2458f72..941d8d31677606c89c7650b22b7b7bf90f042c94 100644
--- a/third_party/WebKit/Source/core/xmlhttprequest/XMLHttpRequest.cpp
+++ b/third_party/WebKit/Source/core/xmlhttprequest/XMLHttpRequest.cpp
@@ -924,6 +924,7 @@ void XMLHttpRequest::createRequest(PassRefPtr<EncodedFormData> httpBody, Excepti
             request.setReportUploadProgress(true);
 
         ASSERT(!m_loader);
+        InspectorInstrumentation::scheduleAsyncTask(&executionContext, "XMLHttpRequest", this);
         m_loader = ThreadableLoader::create(executionContext, this, options, resourceLoaderOptions);
         m_loader->start(request);
 
@@ -1070,10 +1071,12 @@ void XMLHttpRequest::dispatchProgressEvent(const AtomicString& type, long long r
     unsigned long long loaded = receivedLength >= 0 ? static_cast<unsigned long long>(receivedLength) : 0;
     unsigned long long total = lengthComputable ? static_cast<unsigned long long>(expectedLength) : 0;
 
+    Optional<InspectorInstrumentation::AsyncTask> asyncTask;
+    if (type == EventTypeNames::loadend)
+        InspectorInstrumentation::asyncTaskStarted(getExecutionContext(), this);
     m_progressEventThrottle->dispatchProgressEvent(type, lengthComputable, loaded, total);
-
     if (type == EventTypeNames::loadend)
-        InspectorInstrumentation::didDispatchXHRLoadendEvent(getExecutionContext(), this);
+        InspectorInstrumentation::asyncTaskFinished(getExecutionContext(), this);
 }
 
 void XMLHttpRequest::dispatchProgressEventFromSnapshot(const AtomicString& type)