[Extensions] Add extension feature generation code

extensions/common/features/simple_feature.cc

Index: extensions/common/features/simple_feature.cc
diff --git a/extensions/common/features/simple_feature.cc b/extensions/common/features/simple_feature.cc
index b4a39198bcd62498e6f5c0ab5ee210556a1b7227..c74b1a30a75ee7c9c111b92c5d2e8762c85339a0 100644
--- a/extensions/common/features/simple_feature.cc
+++ b/extensions/common/features/simple_feature.cc
@@ -310,7 +310,8 @@ SimpleFeature::SimpleFeature()
     : location_(UNSPECIFIED_LOCATION),
       min_manifest_version_(0),
       max_manifest_version_(0),
-      component_extensions_auto_granted_(true) {}
+      component_extensions_auto_granted_(true),
+      is_internal_(false) {}
 
 SimpleFeature::~SimpleFeature() {}
 
@@ -583,7 +584,7 @@ Feature::Availability SimpleFeature::CreateAvailability(
 }
 
 bool SimpleFeature::IsInternal() const {
-  return false;
+  return is_internal_;
 }
 
 bool SimpleFeature::IsIdInBlacklist(const std::string& extension_id) const {
@@ -659,4 +660,10 @@ bool SimpleFeature::IsValidExtensionId(const std::string& extension_id) {
   return (extension_id.length() == 32);
 }
 
+void SimpleFeature::set_matches(const std::vector<std::string>& matches) {
+  matches_.ClearPatterns();
+  for (const std::string& pattern : matches)
+    matches_.AddPattern(URLPattern(URLPattern::SCHEME_ALL, pattern));
+}
+
 }  // namespace extensions