Instrumenting internals of AccountIdFetcher::Start to locate the source of jankiness.

google_apis/gaia/oauth2_token_service.cc

Index: google_apis/gaia/oauth2_token_service.cc
diff --git a/google_apis/gaia/oauth2_token_service.cc b/google_apis/gaia/oauth2_token_service.cc
index dac940b58ae2e20c51f821599ce2d8216b5b44fd..842bea70f4b30b9fdfccc961db40f1c721484aa1 100644
--- a/google_apis/gaia/oauth2_token_service.cc
+++ b/google_apis/gaia/oauth2_token_service.cc
@@ -214,6 +214,12 @@ OAuth2TokenService::Fetcher* OAuth2TokenService::Fetcher::CreateAndStart(
       client_secret,
       scopes,
       waiting_request);
+
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/422460 is fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "422460 OAuth2TokenService::Fetcher::CreateAndStart"));
+
   fetcher->Start();
   return fetcher;
 }
@@ -461,6 +467,11 @@ OAuth2TokenService::StartRequestForClientWithContext(
     Consumer* consumer) {
   DCHECK(CalledOnValidThread());
 
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/422460 is fixed.
+  tracked_objects::ScopedTracker tracking_profile1(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "422460 OAuth2TokenService::StartRequestForClientWithContext 1"));
+
   scoped_ptr<RequestImpl> request(new RequestImpl(account_id, consumer));
   FOR_EACH_OBSERVER(DiagnosticsObserver, diagnostics_observer_list_,
                     OnAccessTokenRequested(account_id,
@@ -468,6 +479,11 @@ OAuth2TokenService::StartRequestForClientWithContext(
                                            scopes));
 
   if (!RefreshTokenIsAvailable(account_id)) {
+    // TODO(vadimt): Remove ScopedTracker below once crbug.com/422460 is fixed.
+    tracked_objects::ScopedTracker tracking_profile2(
+        FROM_HERE_WITH_EXPLICIT_FUNCTION(
+            "422460 OAuth2TokenService::StartRequestForClientWithContext 2"));
+
     GoogleServiceAuthError error(GoogleServiceAuthError::USER_NOT_SIGNED_UP);
 
     FOR_EACH_OBSERVER(DiagnosticsObserver, diagnostics_observer_list_,
@@ -488,6 +504,11 @@ OAuth2TokenService::StartRequestForClientWithContext(
                                        account_id,
                                        scopes);
   if (HasCacheEntry(request_parameters)) {
+    // TODO(vadimt): Remove ScopedTracker below once crbug.com/422460 is fixed.
+    tracked_objects::ScopedTracker tracking_profile3(
+        FROM_HERE_WITH_EXPLICIT_FUNCTION(
+            "422460 OAuth2TokenService::StartRequestForClientWithContext 3"));
+
     StartCacheLookupRequest(request.get(), request_parameters, consumer);
   } else {
     FetchOAuth2Token(request.get(),
@@ -506,6 +527,11 @@ void OAuth2TokenService::FetchOAuth2Token(RequestImpl* request,
                                           const std::string& client_id,
                                           const std::string& client_secret,
                                           const ScopeSet& scopes) {
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/422460 is fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "422460 OAuth2TokenService::FetchOAuth2Token"));
+
   // If there is already a pending fetcher for |scopes| and |account_id|,
   // simply register this |request| for those results rather than starting
   // a new fetcher.