Support API aliases

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 94b39fb9fd0c5b5f4bf5dce5a5f95bd7e1c17b7e..56df97f3921e1e007c6f8638f58ad9507ef9f6d2 100644
--- a/extensions/common/features/simple_feature.h
+++ b/extensions/common/features/simple_feature.h
@@ -76,6 +76,8 @@ class SimpleFeature : public Feature {
   bool IsInternal() const override;
   bool IsIdInBlacklist(const std::string& extension_id) const override;
   bool IsIdInWhitelist(const std::string& extension_id) const override;
+  std::string GetAlias() const override;
+  std::string GetSource() const override;
 
   static bool IsIdInArray(const std::string& extension_id,
                           const char* const array[],
@@ -123,6 +125,8 @@ class SimpleFeature : public Feature {
   void set_noparent(bool no_parent) { no_parent_ = no_parent; }
   void set_platforms(std::initializer_list<Platform> platforms);
   void set_whitelist(std::initializer_list<const char* const> whitelist);
+  void set_alias(base::StringPiece alias);
+  void set_source(base::StringPiece source);
 
  protected:
   // Accessors used by subclasses in feature verification.
@@ -230,6 +234,8 @@ class SimpleFeature : public Feature {
   bool is_internal_;
   std::string command_line_switch_;
   std::unique_ptr<version_info::Channel> channel_;
+  std::string alias_;
+  std::string source_;
 
   DISALLOW_COPY_AND_ASSIGN(SimpleFeature);
 };