Support "always allow" for runtime script execution

extensions/common/url_pattern.h

Index: extensions/common/url_pattern.h
diff --git a/extensions/common/url_pattern.h b/extensions/common/url_pattern.h
index 5a0e8c6ffd32608ffda548e68b071bfddecba6ad..c7997ca31ec7e22a64710715dd84a1d6e8033c63 100644
--- a/extensions/common/url_pattern.h
+++ b/extensions/common/url_pattern.h
@@ -162,6 +162,9 @@ class URLPattern {
   // cached.
   bool ImpliesAllHosts() const;
 
+  // Returns true if the pattern only matches a single origin.
+  bool MatchesSingleOrigin() const;
+
   // Sets the port. Returns false if the port is invalid.
   bool SetPort(const std::string& port);
   const std::string& port() const { return port_; }