Started measuring time for session restore process.

chrome/browser/chromeos/login/oauth2_login_manager.cc

 // Copyright (c) 2013 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 "chrome/browser/chromeos/login/oauth2_login_manager.h"
 
 #include "base/command_line.h"
 #include "base/metrics/histogram.h"
 #include "base/prefs/pref_service.h"
 #include "base/strings/string_util.h"
@@ skipping 198 matching lines @@
   if (token_service->AreCredentialsValid())
     token_service->StartFetchingTokens();
 }
 
 void OAuth2LoginManager::SetSessionRestoreState(
     OAuth2LoginManager::SessionRestoreState state) {
   if (state_ == state)
     return;
 
   state_ = state;
+  if (state == OAuth2LoginManager::SESSION_RESTORE_FAILED) {
+    UMA_HISTOGRAM_TIMES("OAuth2Login.SessionRestoreTimeToFailure",
+                        base::Time::Now() - session_restore_start_);
+  } else if (state == OAuth2LoginManager::SESSION_RESTORE_DONE) {
+    UMA_HISTOGRAM_TIMES("OAuth2Login.SessionRestoreTimeToSuccess",
+                        base::Time::Now() - session_restore_start_);
+  }
+
   FOR_EACH_OBSERVER(Observer, observer_list_,
                     OnSessionRestoreStateChanged(user_profile_, state_));
 }
 
 void OAuth2LoginManager::SetSessionRestoreStartForTesting(
     const base::Time& time) {
   session_restore_start_ = time;
 }
 
 }  // namespace chromeos