Stop chrome from logging profile counts too many times at startup.

chrome/browser/profiles/gaia_info_update_service.cc

 // Copyright (c) 2012 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/profiles/gaia_info_update_service.h"
 
 #include <stddef.h>
 
 #include "base/strings/utf_string_conversions.h"
 #include "build/build_config.h"
@@ skipping 35 matching lines @@
   last_updated_ = base::Time::FromInternalValue(
       prefs->GetInt64(prefs::kProfileGAIAInfoUpdateTime));
   ScheduleNextUpdate();
 }
 
 GAIAInfoUpdateService::~GAIAInfoUpdateService() {
   DCHECK(!profile_) << "Shutdown not called before dtor";
 }
 
 void GAIAInfoUpdateService::Update() {
-  // UMA Profile Metrics should be logged regularly.
-  ProfileMetrics::LogNumberOfProfiles(g_browser_process->profile_manager());
-
   // The user must be logged in.
   SigninManagerBase* signin_manager =
       SigninManagerFactory::GetForProfile(profile_);
   if (!signin_manager->IsAuthenticated())
     return;
 
   if (profile_image_downloader_)
     return;
   profile_image_downloader_.reset(new ProfileDownloader(this));
   profile_image_downloader_->Start();
@@ skipping 128 matching lines @@
   const base::TimeDelta desired_delta =
       base::TimeDelta::FromHours(kUpdateIntervalHours);
   const base::TimeDelta update_delta = base::Time::Now() - last_updated_;
 
   base::TimeDelta delta;
   if (update_delta < base::TimeDelta() || update_delta > desired_delta)
     delta = base::TimeDelta::FromSeconds(kMinUpdateIntervalSeconds);
   else
     delta = desired_delta - update_delta;
 
+  // UMA Profile Metrics should be logged regularly.  Logging is not performed
+  // in Update() because it is a public method and may be called at any time.
+  // These metrics should logged only on this schedule.
+  //
+  // In mac perf tests, the browser process pointer may be null.
+  if (g_browser_process)
+    ProfileMetrics::LogNumberOfProfiles(g_browser_process->profile_manager());
+
   timer_.Start(FROM_HERE, delta, this, &GAIAInfoUpdateService::Update);
 }
 
 void GAIAInfoUpdateService::GoogleSigninSucceeded(
     const std::string& account_id,
     const std::string& username,
     const std::string& password) {
   OnUsernameChanged(username);
 }
 
 void GAIAInfoUpdateService::GoogleSignedOut(const std::string& account_id,
                                             const std::string& username) {
   OnUsernameChanged(std::string());
 }