Only populate line number in case parsing synchronously.

Source/core/xml/parser/XMLDocumentParser.cpp

 /*
  * Copyright (C) 2000 Peter Kelly (pmk@post.com)
  * Copyright (C) 2005, 2006, 2008, 2014 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2007 Samuel Weinig (sam@webkit.org)
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2008 Holger Hans Peter Freyther
  * Copyright (C) 2008 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 1489 matching lines @@
     if (source.isEmpty())
         return 0;
     // Parse in a single chunk into an xmlDocPtr
     // FIXME: Hook up error handlers so that a failure to parse the main
     // document results in good error messages.
     XMLDocumentParserScope scope(fetcher, errorFunc, 0);
     XMLParserInput input(source);
     return xmlReadMemory(input.data(), input.size(), url.latin1().data(), input.encoding(), XSLT_PARSE_OPTIONS);
 }
 
+bool XMLDocumentParser::hasLineNumber() const
+{
+    return true;

[rmcilroy, 2014/12/12 14:18:31]

maybe return isParsing()?

[pfeldman, 2014/12/12 17:21:06]

Done, all necessary checks are in ScriptableDocumentParser now.

+}
+
 OrdinalNumber XMLDocumentParser::lineNumber() const
 {
     return OrdinalNumber::fromOneBasedInt(context() ? context()->input->line : 1);
 }
 
 OrdinalNumber XMLDocumentParser::columnNumber() const
 {
     return OrdinalNumber::fromOneBasedInt(context() ? context()->input->col : 1);
 }
 
@@ skipping 120 matching lines @@
     sax.initialized = XML_SAX2_MAGIC;
     RefPtr<XMLParserContext> parser = XMLParserContext::createStringParser(&sax, &state);
     String parseString = "<?xml version=\"1.0\"?><attrs " + string + " />";
     parseChunk(parser->context(), parseString);
     finishParsing(parser->context());
     attrsOK = state.gotAttributes;
     return state.attributes;
 }
 
 } // namespace blink