Support a "policy" extension location in extension features files. At the same

extensions/common/features/simple_feature.h

Index: extensions/common/features/simple_feature.h
diff --git a/extensions/common/features/simple_feature.h b/extensions/common/features/simple_feature.h
index e3884e014c73da53a6c994a45be303c964c50ddd..c085928b7712a14482bb813666c92d86540ae849 100644
--- a/extensions/common/features/simple_feature.h
+++ b/extensions/common/features/simple_feature.h
@@ -39,8 +39,7 @@ class SimpleFeature : public Feature {
   // the error found, or an empty string on success.
   virtual std::string Parse(const base::DictionaryValue* value);
 
-  Location location() const { return location_; }
-  void set_location(Location location) { location_ = location; }
+  std::set<Manifest::Location>* locations() { return &locations_; }
 
   std::set<Platform>* platforms() { return &platforms_; }
 
@@ -72,7 +71,7 @@ class SimpleFeature : public Feature {
   // extension::Feature:
   virtual Availability IsAvailableToManifest(const std::string& extension_id,
                                              Manifest::Type type,
-                                             Location location,
+                                             Manifest::Location location,
                                              int manifest_version,
                                              Platform platform) const OVERRIDE;
 
@@ -113,7 +112,7 @@ class SimpleFeature : public Feature {
   std::set<Manifest::Type> extension_types_;
   std::set<Context> contexts_;
   URLPatternSet matches_;
-  Location location_;  // we only care about component/not-component now
+  std::set<Manifest::Location> locations_;
   std::set<Platform> platforms_;
   int min_manifest_version_;
   int max_manifest_version_;