Add first-class support for user scripts

base/string_util.h

Index: base/string_util.h
diff --git a/base/string_util.h b/base/string_util.h
index 1c58e91990a8a4e8a250d4f72af406de54427469..89caf4f29818f200a43de7fc32b2b03ff32d1397 100644
--- a/base/string_util.h
+++ b/base/string_util.h
@@ -291,6 +291,9 @@ bool StartsWith(const string16& str,
                 bool case_sensitive);
 
 // Returns true if str ends with search, or false otherwise.
+bool EndsWith(const std::string& str,
+              const std::string& search,
+              bool case_sensitive);
 bool EndsWith(const std::wstring& str,
               const std::wstring& search,
               bool case_sensitive);