[protector] Added SessionStartupChange for representing changes in SessionStartupPref.

chrome/browser/protector/histograms.h

Index: chrome/browser/protector/histograms.h
diff --git a/chrome/browser/protector/histograms.h b/chrome/browser/protector/histograms.h
index 09cc7c49c9da4a21b2197ae0c07af03715da664a..410026aa2e7082085cd00c938b7bbd56309c4f65 100644
--- a/chrome/browser/protector/histograms.h
+++ b/chrome/browser/protector/histograms.h
@@ -47,13 +47,23 @@ extern const char kProtectorHistogramSearchProviderRestored[];
 // Histogram name to report when user ignores search provider change.
 extern const char kProtectorHistogramSearchProviderTimeout[];
 
-// Returns index to be used in histograms for given search provider (which may
-// be NULL, in which case a special index will be returned).
-int GetSearchProviderHistogramID(const TemplateURL* turl);
+// Histogram name to report when user accepts new startup settings.
+extern const char kProtectorHistogramStartupSettingsApplied[];
+// Histogram name to report the new startup settings when the backup is
+// valid and a change is detected.
+extern const char kProtectorHistogramStartupSettingsChanged[];
+// Histogram name to report when keeps previous startup settings.
+extern const char kProtectorHistogramStartupSettingsDiscarded[];
+// Histogram name to report when user ignores startup settings change.
+extern const char kProtectorHistogramStartupSettingsTimeout[];
 
 // Maximum value of search provider index in histogram enums.
 extern const int kProtectorMaxSearchProviderID;
 
+// Returns index to be used in histograms for given search provider (which may
+// be NULL, in which case a special index will be returned).
+int GetSearchProviderHistogramID(const TemplateURL* turl);
+
 }  // namespace protector
 
 #endif  // CHROME_BROWSER_PROTECTOR_HISTOGRAMS_H_