Instrument parser blocking script execution time.

third_party/WebKit/Source/core/dom/DocumentParserTiming.cpp

Index: third_party/WebKit/Source/core/dom/DocumentParserTiming.cpp
diff --git a/third_party/WebKit/Source/core/dom/DocumentParserTiming.cpp b/third_party/WebKit/Source/core/dom/DocumentParserTiming.cpp
index 2909028cd25b30df0350d4b98c0c2a2ba80b0ad5..d48d37a876f9e25c2ec4ad454f32bc329a437290 100644
--- a/third_party/WebKit/Source/core/dom/DocumentParserTiming.cpp
+++ b/third_party/WebKit/Source/core/dom/DocumentParserTiming.cpp
@@ -56,6 +56,17 @@ void DocumentParserTiming::recordParserBlockedOnScriptLoadDuration(
     notifyDocumentParserTimingChanged();
 }
 
+void DocumentParserTiming::recordParserBlockedOnScriptExecutionDuration(
+    double duration, bool scriptInsertedViaDocumentWrite)
+{
+    if (m_parserDetached || m_parserStart == 0.0 || m_parserStop > 0.0)
+        return;
+    m_parserBlockedOnScriptExecutionDuration += duration;
+    if (scriptInsertedViaDocumentWrite)
+        m_parserBlockedOnScriptExecutionFromDocumentWriteDuration += duration;
+    notifyDocumentParserTimingChanged();
+}
+
 DEFINE_TRACE(DocumentParserTiming)
 {
     visitor->trace(m_document);