Add a trace event in FrameLoader::updateForSameDocumentNavigation.

third_party/WebKit/Source/core/loader/FrameLoader.cpp

Index: third_party/WebKit/Source/core/loader/FrameLoader.cpp
diff --git a/third_party/WebKit/Source/core/loader/FrameLoader.cpp b/third_party/WebKit/Source/core/loader/FrameLoader.cpp
index 2669c912e5def6dc81ef34fa870a8627523764b5..0b2a00addeebb651512841f4d76ac2077b5857f0 100644
--- a/third_party/WebKit/Source/core/loader/FrameLoader.cpp
+++ b/third_party/WebKit/Source/core/loader/FrameLoader.cpp
@@ -799,6 +799,8 @@ void FrameLoader::updateForSameDocumentNavigation(
     HistoryScrollRestorationType scrollRestorationType,
     FrameLoadType type,
     Document* initiatingDocument) {
+  TRACE_EVENT1("blink", "FrameLoader::updateForSameDocumentNavigation", "url",
+               newURL.getString().ascii().data());
   // Update the data source's request with the new URL to fake the URL change
   m_frame->document()->setURL(newURL);
   documentLoader()->setReplacesCurrentHistoryItem(type !=