Trace more methods under HTMLDocumentParser::insert

Source/core/html/parser/HTMLPreloadScanner.cpp

Index: Source/core/html/parser/HTMLPreloadScanner.cpp
diff --git a/Source/core/html/parser/HTMLPreloadScanner.cpp b/Source/core/html/parser/HTMLPreloadScanner.cpp
index 5f55827bd83983311ed58558a502dfe055d1d135..562cdae7cd2aec93f6ac4b09069b921dcbe041c6 100644
--- a/Source/core/html/parser/HTMLPreloadScanner.cpp
+++ b/Source/core/html/parser/HTMLPreloadScanner.cpp
@@ -393,6 +393,8 @@ void HTMLPreloadScanner::scan(HTMLResourcePreloader* preloader, const KURL& star
 {
     ASSERT(isMainThread()); // HTMLTokenizer::updateStateFor only works on the main thread.
 
+    TRACE_EVENT1("webkit", "HTMLPreloadScanner::scan", "source_length", m_source.length());
+
     // When we start scanning, our best prediction of the baseElementURL is the real one!
     if (!startingBaseElementURL.isEmpty())
         m_scanner.setPredictedBaseElementURL(startingBaseElementURL);