Implement ComplexFeature to support permission features with multiple rules.

chrome/common/extensions/features/simple_feature_provider.h

Index: chrome/common/extensions/features/simple_feature_provider.h
diff --git a/chrome/common/extensions/features/simple_feature_provider.h b/chrome/common/extensions/features/simple_feature_provider.h
index 6da884e256e042694e3ae102c764f42a7464d4e8..e4000dee0e9e9d396ce7a8f5dc386ea54b1cf7b1 100644
--- a/chrome/common/extensions/features/simple_feature_provider.h
+++ b/chrome/common/extensions/features/simple_feature_provider.h
@@ -5,6 +5,7 @@
 #ifndef CHROME_COMMON_EXTENSIONS_FEATURES_SIMPLE_FEATURE_PROVIDER_H_
 #define CHROME_COMMON_EXTENSIONS_FEATURES_SIMPLE_FEATURE_PROVIDER_H_
 
+#include <map>
 #include <set>
 #include <string>
 
@@ -12,13 +13,14 @@
 #include "base/values.h"
 #include "chrome/common/extensions/features/feature.h"
 #include "chrome/common/extensions/features/feature_provider.h"
+#include "chrome/common/extensions/features/simple_feature.h"
 
 namespace extensions {
 
 // Reads Features out of a simple JSON file description.
 class SimpleFeatureProvider : public FeatureProvider {
  public:
-  typedef Feature*(*FeatureFactory)();
+  typedef SimpleFeature*(*FeatureFactory)();
 
   // Creates a new SimpleFeatureProvider. Pass null to |factory| to have the
   // provider create plain old Feature instances.
@@ -37,10 +39,10 @@ class SimpleFeatureProvider : public FeatureProvider {
   std::set<std::string> GetAllFeatureNames() const;
 
   // Gets the feature |feature_name|, if it exists.
-  virtual Feature* GetFeature(const std::string& feature_name) OVERRIDE;
+  virtual SimpleFeature* GetFeature(const std::string& feature_name) OVERRIDE;
 
  private:
-  typedef std::map<std::string, linked_ptr<Feature> > FeatureMap;
+  typedef std::map<std::string, linked_ptr<SimpleFeature> > FeatureMap;
   FeatureMap features_;
 
   FeatureFactory factory_;