Adding instrumentation to locate the source of jankiness.

google_apis/gaia/oauth2_access_token_fetcher_impl.cc

Index: google_apis/gaia/oauth2_access_token_fetcher_impl.cc
diff --git a/google_apis/gaia/oauth2_access_token_fetcher_impl.cc b/google_apis/gaia/oauth2_access_token_fetcher_impl.cc
index 08e45d2e18b423b0458a6e85eed6fe6907ec7b46..7ef13abb8e677a0db8379bae50e2d28c19a0c2e0 100644
--- a/google_apis/gaia/oauth2_access_token_fetcher_impl.cc
+++ b/google_apis/gaia/oauth2_access_token_fetcher_impl.cc
@@ -11,6 +11,7 @@
 #include "base/json/json_reader.h"
 #include "base/metrics/histogram.h"
 #include "base/metrics/sparse_histogram.h"
+#include "base/profiler/scoped_profile.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/time/time.h"
@@ -258,6 +259,11 @@ void OAuth2AccessTokenFetcherImpl::OnGetTokenFailure(
 
 void OAuth2AccessTokenFetcherImpl::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 OAuth2AccessTokenFetcherImpl::OnURLFetchComplete"));
+
   CHECK(source);
   CHECK(state_ == GET_ACCESS_TOKEN_STARTED);
   EndGetAccessToken(source);