add globbing util function

experimental/skpdiff/skpdiff_util.h

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef skpdiff_util_DEFINED
 #define skpdiff_util_DEFINED
 
@@ skipping 16 matching lines @@
 double get_seconds();
 
 /**
  * Get file entries of the given directory.
  * @param  path    A path to a directory to enumerate
  * @param  entries A vector to return the results into
  * @return         True on success, false otherwise
  */
 bool get_directory(const char path[], SkTArray<SkString>* entries);
 
+/**
+ * Gets the files that match the specified pattern in sorted order.
+ * @param  globPattern The pattern to use. Patterns must be valid paths, optionally with wildcards (*)
+ * @param  entries     An array to return the results into
+ * @return             True on success, false otherwise
+ */
+bool glob_files(const char globPattern[], SkTArray<SkString>* entries);
+
 
 #endif