Adding instrumentation to locate the source of jankiness.

chrome/browser/safe_browsing/client_side_detection_service.cc

Index: chrome/browser/safe_browsing/client_side_detection_service.cc
diff --git a/chrome/browser/safe_browsing/client_side_detection_service.cc b/chrome/browser/safe_browsing/client_side_detection_service.cc
index 41e4ecc838cd1d497486bc57d2bca460e8cc1c97..485d20bf455bf1c6140f2b83ab11835e5cbd1931 100644
--- a/chrome/browser/safe_browsing/client_side_detection_service.cc
+++ b/chrome/browser/safe_browsing/client_side_detection_service.cc
@@ -14,6 +14,7 @@
 #include "base/metrics/histogram.h"
 #include "base/metrics/sparse_histogram.h"
 #include "base/prefs/pref_service.h"
+#include "base/profiler/scoped_profile.h"
 #include "base/stl_util.h"
 #include "base/strings/string_util.h"
 #include "base/time/time.h"
@@ -198,6 +199,11 @@ bool ClientSideDetectionService::IsPrivateIPAddress(
 
 void ClientSideDetectionService::OnURLFetchComplete(
     const net::URLFetcher* source) {
+  // TODO(vadimt): Remove ScopedProfile below once crbug.com/422577 is fixed.
+  tracked_objects::ScopedProfile tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "422577 ClientSideDetectionService::OnURLFetchComplete"));
+
   std::string data;
   source->GetResponseAsString(&data);
   if (source == model_fetcher_.get()) {