Support "always allow" for runtime script execution

extensions/common/url_pattern.cc

Index: extensions/common/url_pattern.cc
diff --git a/extensions/common/url_pattern.cc b/extensions/common/url_pattern.cc
index 735e71e9fa0298704005aa12e3f11fd8fabbc86e..61f8024d58af07a3a0fe6855b6cebfbf9e3eea7a 100644
--- a/extensions/common/url_pattern.cc
+++ b/extensions/common/url_pattern.cc
@@ -466,6 +466,11 @@ bool URLPattern::ImpliesAllHosts() const {
   return registry_length > 0;
 }
 
+bool URLPattern::MatchesSingleOrigin() const {
+  // We ignore the port because it's not all that interesting.
+  return !ImpliesAllHosts() && scheme_ != "*" && !match_subdomains_;
+}
+
 bool URLPattern::MatchesPath(const std::string& test) const {
   // Make the behaviour of OverlapsWith consistent with MatchesURL, which is
   // need to match hosted apps on e.g. 'google.com' also run on 'google.com/'.