[protector] Added SessionStartupChange for representing changes in SessionStartupPref.

chrome/browser/protector/histograms.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/protector/histograms.h"
 
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/search_engines/search_engine_type.h"
 #include "chrome/browser/search_engines/template_url.h"
 #include "chrome/browser/search_engines/template_url_prepopulate_data.h"
@@ skipping 13 matching lines @@
     "Protector.SearchProvider.Fallback";
 const char kProtectorHistogramSearchProviderHijacked[] =
     "Protector.SearchProvider.Hijacked";
 const char kProtectorHistogramSearchProviderMissing[] =
     "Protector.SearchProvider.Missing";
 const char kProtectorHistogramSearchProviderRestored[] =
     "Protector.SearchProvider.Restored";
 const char kProtectorHistogramSearchProviderTimeout[] =
     "Protector.SearchProvider.Timeout";
 
+const char kProtectorHistogramStartupSettingsApplied[] =
+    "Protector.StartupSettings.Applied";
+const char kProtectorHistogramStartupSettingsChanged[] =
+    "Protector.StartupSettings.Changed";
+const char kProtectorHistogramStartupSettingsDiscarded[] =
+    "Protector.StartupSettings.Discarded";
+const char kProtectorHistogramStartupSettingsTimeout[] =
+    "Protector.StartupSettings.Timeout";
+
 const int kProtectorMaxSearchProviderID = SEARCH_ENGINE_MAX;
 
 int GetSearchProviderHistogramID(const TemplateURL* turl) {
   if (!turl || !turl->url())
     return SEARCH_ENGINE_NONE;
   scoped_ptr<TemplateURL> prepopulated_url(
       TemplateURLPrepopulateData::FindPrepopulatedEngine(turl->url()->url()));
   if (prepopulated_url.get())
     return static_cast<int>(prepopulated_url->search_engine_type());
   // If |turl| is not among the prepopulated providers, return
   // SEARCH_ENGINE_OTHER as well.
   return SEARCH_ENGINE_OTHER;
 }
 
 }  // namespace protector