Add UseCounter for synchronous XMLHttpRequests

Source/core/xml/XMLHttpRequest.cpp

 /*
  *  Copyright (C) 2004, 2006, 2008 Apple Inc. All rights reserved.
  *  Copyright (C) 2005-2007 Alexey Proskuryakov <ap@webkit.org>
  *  Copyright (C) 2007, 2008 Julien Chaffraix <jchaffraix@webkit.org>
  *  Copyright (C) 2008, 2011 Google Inc. All rights reserved.
  *  Copyright (C) 2012 Intel Corporation
  *
  *  This library is free software; you can redistribute it and/or
  *  modify it under the terms of the GNU Lesser General Public
  *  License as published by the Free Software Foundation; either
@@ skipping 17 matching lines @@
 #include "core/dom/ContextFeatures.h"
 #include "core/dom/DOMImplementation.h"
 #include "core/dom/ExceptionCode.h"
 #include "core/dom/XMLDocument.h"
 #include "core/editing/markup.h"
 #include "core/events/Event.h"
 #include "core/fetch/CrossOriginAccessControl.h"
 #include "core/fileapi/Blob.h"
 #include "core/fileapi/File.h"
 #include "core/fileapi/Stream.h"
+#include "core/frame/Settings.h"
+#include "core/frame/UseCounter.h"
 #include "core/frame/csp/ContentSecurityPolicy.h"
 #include "core/html/DOMFormData.h"
 #include "core/html/HTMLDocument.h"
 #include "core/html/parser/TextResourceDecoder.h"
 #include "core/inspector/InspectorInstrumentation.h"
 #include "core/inspector/InspectorTraceEvents.h"
 #include "core/loader/ThreadableLoader.h"
-#include "core/frame/Settings.h"
 #include "core/xml/XMLHttpRequestProgressEvent.h"
 #include "core/xml/XMLHttpRequestUpload.h"
 #include "platform/Logging.h"
 #include "platform/RuntimeEnabledFeatures.h"
 #include "platform/SharedBuffer.h"
 #include "platform/blob/BlobData.h"
 #include "platform/network/HTTPParsers.h"
 #include "platform/network/ParsedContentType.h"
 #include "platform/network/ResourceError.h"
 #include "platform/network/ResourceRequest.h"
@@ skipping 509 matching lines @@
         return;
     }
 
     if (!ContentSecurityPolicy::shouldBypassMainWorld(executionContext()) && !executionContext()->contentSecurityPolicy()->allowConnectToSource(url)) {
         // We can safely expose the URL to JavaScript, as these checks happen synchronously before redirection. JavaScript receives no new information.
         exceptionState.throwSecurityError("Refused to connect to '" + url.elidedString() + "' because it violates the document's Content Security Policy.");
         return;
     }
 
     if (!async && executionContext()->isDocument()) {
+        // Use count for XHR synchronous requests.
+        UseCounter::count(document(), UseCounter::XMLHttpRequestSynchronous);
+
         if (document()->settings() && !document()->settings()->syncXHRInDocumentsEnabled()) {
             exceptionState.throwDOMException(InvalidAccessError, "Synchronous requests are disabled for this page.");
             return;
         }
 
         // Newer functionality is not available to synchronous requests in window contexts, as a spec-mandated
         // attempt to discourage synchronous XHR use. responseType is one such piece of functionality.
         if (m_responseTypeCode != ResponseTypeDefault) {
             exceptionState.throwDOMException(InvalidAccessError, "Synchronous requests from a document must not set a response type.");
             return;
@@ skipping 873 matching lines @@
 {
     visitor->trace(m_responseBlob);
     visitor->trace(m_responseStream);
     visitor->trace(m_responseDocument);
     visitor->trace(m_progressEventThrottle);
     visitor->trace(m_upload);
     XMLHttpRequestEventTarget::trace(visitor);
 }
 
 } // namespace WebCore