Support API aliases

extensions/common/features/feature.h

Index: extensions/common/features/feature.h
diff --git a/extensions/common/features/feature.h b/extensions/common/features/feature.h
index cc3ee7f3cb13b4d7aa11c25a8fecccb9e806defe..1ff5b9790e0e52c322449e5c675fad3486018916 100644
--- a/extensions/common/features/feature.h
+++ b/extensions/common/features/feature.h
@@ -145,6 +145,8 @@ class Feature {
 
   virtual bool IsIdInBlacklist(const std::string& extension_id) const = 0;
   virtual bool IsIdInWhitelist(const std::string& extension_id) const = 0;
+  virtual std::string GetAlias() const = 0;
+  virtual std::string GetSource() const = 0;

[Devlin, 2016/11/14 18:03:56]

We document that complex features only support a single alias/source - with
that, we should be able to put alias and source on Feature itself and avoid
having it be virtual.

[tbarzic, 2016/11/15 04:45:07]

Done.

 
   void set_check_channel(bool check_channel) { check_channel_ = check_channel; }