Metrics for feature engagement tracker.

components/feature_engagement_tracker/internal/configuration.h

 // Copyright 2017 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 COMPONENTS_FEATURE_ENGAGEMENT_TRACKER_INTERNAL_CONFIGURATION_H_
 #define COMPONENTS_FEATURE_ENGAGEMENT_TRACKER_INTERNAL_CONFIGURATION_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 106 matching lines @@
   // Convenience alias for typical implementations of Configuration.
   using ConfigMap = std::map<const base::Feature*, FeatureConfig>;
 
   virtual ~Configuration() = default;
 
   // Returns the FeatureConfig for the given |feature|. The |feature| must
   // be registered with the Configuration instance.
   virtual const FeatureConfig& GetFeatureConfig(
       const base::Feature& feature) const = 0;
 
+  // Returns the immutable ConfigMap that contains all registered features.
+  virtual const ConfigMap& GetRegisteredFeatures() const = 0;
+
  protected:
   Configuration() = default;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(Configuration);
 };
 
 }  // namespace feature_engagement_tracker
 
 #endif  // COMPONENTS_FEATURE_ENGAGEMENT_TRACKER_INTERNAL_CONFIGURATION_H_