Adding instrumentation to locate the source of jankiness.

chrome/browser/extensions/chrome_url_request_util.cc

Index: chrome/browser/extensions/chrome_url_request_util.cc
diff --git a/chrome/browser/extensions/chrome_url_request_util.cc b/chrome/browser/extensions/chrome_url_request_util.cc
index e444c46718202d1548e10d9826fd69549f08efac..6967e5d242ff87a4dd95dfd424199b3c94627ea3 100644
--- a/chrome/browser/extensions/chrome_url_request_util.cc
+++ b/chrome/browser/extensions/chrome_url_request_util.cc
@@ -9,6 +9,7 @@
 #include "base/files/file_path.h"
 #include "base/memory/weak_ptr.h"
 #include "base/path_service.h"
+#include "base/profiler/scoped_profile.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
@@ -62,6 +63,11 @@ class URLRequestResourceBundleJob : public net::URLRequestSimpleJob {
                       std::string* charset,
                       std::string* data,
                       const net::CompletionCallback& callback) const override {
+    // TODO(vadimt): Remove ScopedProfile below once crbug.com/422489 is fixed.
+    tracked_objects::ScopedProfile tracking_profile(
+        FROM_HERE_WITH_EXPLICIT_FUNCTION(
+            "422489 URLRequestResourceBundleJob::GetData"));
+
     const ResourceBundle& rb = ResourceBundle::GetSharedInstance();
     *data = rb.GetRawDataResource(resource_id_).as_string();