Instrumenting AccountTracker::StartFetchingUserInfo to locate the source of jankiness

google_apis/gaia/account_tracker.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "google_apis/gaia/account_tracker.h"
 
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
 #include "base/profiler/scoped_tracker.h"
 #include "base/stl_util.h"
@@ skipping 218 matching lines @@
   while (!accounts_.empty())
     StopTrackingAccount(accounts_.begin()->first);
 }
 
 void AccountTracker::StartFetchingUserInfo(const std::string account_key) {
   // TODO(vadimt): Remove ScopedTracker below once crbug.com/422460 is fixed.
   tracked_objects::ScopedTracker tracking_profile(
       FROM_HERE_WITH_EXPLICIT_FUNCTION(
           "422460 AccountTracker::StartFetchingUserInfo"));
 
-  if (ContainsKey(user_info_requests_, account_key))
+  if (ContainsKey(user_info_requests_, account_key)) {
+    // TODO(vadimt): Remove ScopedTracker below once crbug.com/422460 is fixed.
+    tracked_objects::ScopedTracker tracking_profile1(
+        FROM_HERE_WITH_EXPLICIT_FUNCTION(
+            "422460 AccountTracker::StartFetchingUserInfo 1"));
+
     DeleteFetcher(user_info_requests_[account_key]);
+  }
 
   DVLOG(1) << "StartFetching " << account_key;
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/422460 is fixed.
+  tracked_objects::ScopedTracker tracking_profile2(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "422460 AccountTracker::StartFetchingUserInfo 2"));
+
   AccountIdFetcher* fetcher =
       new AccountIdFetcher(identity_provider_->GetTokenService(),
                            request_context_getter_.get(),
                            this,
                            account_key);
   user_info_requests_[account_key] = fetcher;
+
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/422460 is fixed.
+  tracked_objects::ScopedTracker tracking_profile3(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "422460 AccountTracker::StartFetchingUserInfo 3"));
+
   fetcher->Start();
 }
 
 void AccountTracker::OnUserInfoFetchSuccess(AccountIdFetcher* fetcher,
                                             const std::string& gaia_id) {
   const std::string& account_key = fetcher->account_key();
   DCHECK(ContainsKey(accounts_, account_key));
   AccountState& account = accounts_[account_key];
 
   account.ids.gaia = gaia_id;
@@ skipping 96 matching lines @@
                                "AccountIdFetcher",
                                this,
                                "OnNetworkError",
                                "response_code",
                                response_code);
   LOG(ERROR) << "OnNetworkError " << response_code;
   tracker_->OnUserInfoFetchFailure(this);
 }
 
 }  // namespace gaia