Support requesting subsets of host permissions using the permissions API.

extensions/common/url_pattern_set.cc

Index: extensions/common/url_pattern_set.cc
diff --git a/extensions/common/url_pattern_set.cc b/extensions/common/url_pattern_set.cc
index 40663201c1c5a66169f5160a43eaa67f8f7d6f5f..36498935c7b216b10406f57b196bac8f4a808bd0 100644
--- a/extensions/common/url_pattern_set.cc
+++ b/extensions/common/url_pattern_set.cc
@@ -134,6 +134,26 @@ bool URLPatternSet::Contains(const URLPatternSet& set) const {
                        set.patterns_.begin(), set.patterns_.end());
 }
 
+bool URLPatternSet::EncompassesPattern(const URLPattern& pattern) const {
+  for (URLPatternSet::const_iterator it = begin();
+       it != end(); ++it) {
+    if (it->Encompasses(pattern))
+      return true;
+  }
+
+  return false;
+}
+
+bool URLPatternSet::Encompasses(const URLPatternSet& other) const {
+  for (URLPatternSet::const_iterator it = other.begin();
+       it != other.end(); ++it) {
+    if (!EncompassesPattern(*it))
+      return false;
+  }
+
+  return true;
+}
+
 bool URLPatternSet::MatchesURL(const GURL& url) const {
   for (URLPatternSet::const_iterator pattern = patterns_.begin();
        pattern != patterns_.end(); ++pattern) {
@@ -216,4 +236,16 @@ bool URLPatternSet::Populate(const base::ListValue& value,
   return Populate(patterns, valid_schemes, allow_file_access, error);
 }
 
+std::ostream& operator<<(std::ostream& out, const URLPatternSet& set) {
+  bool needs_comma = false;
+  out << "{";
+  for (URLPatternSet::const_iterator it = set.begin(); it != set.end(); ++it) {
+    if (needs_comma)

[Matt Perry, 2013/02/12 01:14:47]

could this just be "it != set.begin()" ?

[not at google - send to devlin, 2013/02/12 01:49:36]

Done.

+      out << ",";
+    needs_comma = true;
+    out << it->GetAsString();
+  }
+  return out << "}";
+}
+
 }  // namespace extensions