Only populate line number in case parsing synchronously.

Source/core/html/parser/HTMLDocumentParser.cpp

Index: Source/core/html/parser/HTMLDocumentParser.cpp
diff --git a/Source/core/html/parser/HTMLDocumentParser.cpp b/Source/core/html/parser/HTMLDocumentParser.cpp
index c7fc2c6758a7e9a5a4ab7963765ce371c79d535c..f0d2e2f0d6f2391fa45218e80291df35990f74b5 100644
--- a/Source/core/html/parser/HTMLDocumentParser.cpp
+++ b/Source/core/html/parser/HTMLDocumentParser.cpp
@@ -119,6 +119,7 @@ HTMLDocumentParser::HTMLDocumentParser(HTMLDocument& document, bool reportErrors
     , m_tasksWereSuspended(false)
     , m_pumpSessionNestingLevel(0)
     , m_pumpSpeculationsSessionNestingLevel(0)
+    , m_hasLineNumber(false)
 {
     ASSERT(shouldUseThreading() || (m_token && m_tokenizer));
 }
@@ -415,6 +416,7 @@ void HTMLDocumentParser::discardSpeculationsAndResumeFrom(PassOwnPtr<ParsedChunk
 size_t HTMLDocumentParser::processParsedChunkFromBackgroundParser(PassOwnPtr<ParsedChunk> popChunk)
 {
     TRACE_EVENT0("blink", "HTMLDocumentParser::processParsedChunkFromBackgroundParser");
+    m_hasLineNumber = true;

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

nit - how about using TemporaryChange here?

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

Done.

 
     ASSERT_WITH_SECURITY_IMPLICATION(document()->activeParserCount() == 1);
     ASSERT(!isParsingFragment());
@@ -489,6 +491,8 @@ size_t HTMLDocumentParser::processParsedChunkFromBackgroundParser(PassOwnPtr<Par
     if (!isStopped())
         m_treeBuilder->flush(FlushIfAtTextLimit);
 
+    m_hasLineNumber = false;
+
     return elementTokenCount;
 }
 
@@ -907,6 +911,11 @@ bool HTMLDocumentParser::isExecutingScript() const
     return m_scriptRunner->isExecutingScript();
 }
 
+bool HTMLDocumentParser::hasLineNumber() const
+{
+    return m_hasLineNumber;
+}
+
 OrdinalNumber HTMLDocumentParser::lineNumber() const
 {
     if (m_haveBackgroundParser)