Introduce incognito preference settings.

chrome/browser/extensions/test_extension_prefs.h

Index: chrome/browser/extensions/test_extension_prefs.h
diff --git a/chrome/browser/extensions/test_extension_prefs.h b/chrome/browser/extensions/test_extension_prefs.h
index 3220d7a263bdf34792ddecc54484364135217d3c..1fa2351203d3a46fcfdf58cb1b022aa06270dd51 100644
--- a/chrome/browser/extensions/test_extension_prefs.h
+++ b/chrome/browser/extensions/test_extension_prefs.h
@@ -14,6 +14,7 @@
 
 class DictionaryValue;
 class ExtensionPrefs;
+class ExtensionPrefValueMap;
 class PrefService;
 
 // This is a test class intended to make it easier to work with ExtensionPrefs
@@ -44,12 +45,15 @@ class TestExtensionPrefs {
   // assigned.
   std::string AddExtensionAndReturnId(std::string name);
 
+  PrefService* CreateIncognitoPrefService() const;
+
  protected:
   ScopedTempDir temp_dir_;
   FilePath preferences_file_;
   FilePath extensions_dir_;
   scoped_ptr<PrefService> pref_service_;
   scoped_ptr<ExtensionPrefs> prefs_;
+  scoped_ptr<ExtensionPrefValueMap> extension_pref_value_map_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(TestExtensionPrefs);