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..8fa79309b34b9660ed77d00d68845f41a41936fd 100644
--- a/extensions/common/url_pattern.cc
+++ b/extensions/common/url_pattern.cc
@@ -466,6 +466,10 @@ bool URLPattern::ImpliesAllHosts() const {
   return registry_length > 0;
 }
 
+bool URLPattern::MatchesSingleOrigin() const {
+  return !(ImpliesAllHosts() || match_subdomains_);

[not at google - send to devlin, 2014/08/11 22:59:30]

nit: I find negation of nested conditions harder to parse than unwrapping them
like !ImpliesAllHosts && !match_subdomains.

[gpdavis, 2014/08/12 00:52:05]

Done.

+}
+
 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/'.