Support API aliases

extensions/common/features/feature.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef EXTENSIONS_COMMON_FEATURES_FEATURE_H_
 #define EXTENSIONS_COMMON_FEATURES_FEATURE_H_
 
 #include <set>
 #include <string>
 
@@ skipping 127 matching lines @@
   // configured by command line flags and/or Chrome channel.
   //
   // Generally try not to use this function. Even if you don't think a Feature
   // relies on an Extension now - maybe it will, one day, so if there's an
   // Extension available (or a runtime context, etc) then use the more targeted
   // method instead.
   Availability IsAvailableToEnvironment() const;
 
   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; }
 
  protected:
   std::string name_;
   bool no_parent_;
   // TODO(devlin): Remove this once we set the feature channel for tests.
   bool check_channel_;
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_COMMON_FEATURES_FEATURE_H_