Support "always allow" for runtime script execution

extensions/common/url_pattern_set.h

Index: extensions/common/url_pattern_set.h
diff --git a/extensions/common/url_pattern_set.h b/extensions/common/url_pattern_set.h
index c17f613442dd0111808a6b6684343c72ed69c6ad..30db55827b9268ddd2df76e0da4d72bda311b3f1 100644
--- a/extensions/common/url_pattern_set.h
+++ b/extensions/common/url_pattern_set.h
@@ -69,6 +69,9 @@ class URLPatternSet {
 
   void ClearPatterns();
 
+  // Adds a pattern based on |origin| to the set.
+  bool AddOrigin(int valid_schemes, const GURL& origin);
+
   // Returns true if every URL that matches |set| is matched by this. In other
   // words, if every pattern in |set| is encompassed by a pattern in this.
   bool Contains(const URLPatternSet& set) const;