diff --git a/metrics/metrics_library.h b/metrics/metrics_library.h
index b9b817a..4bbd0d3 100644
--- a/metrics/metrics_library.h
+++ b/metrics/metrics_library.h
@@ -16,6 +16,7 @@
   virtual bool SendToUMA(const std::string& name, int sample,
                          int min, int max, int nbuckets) = 0;
   virtual bool SendEnumToUMA(const std::string& name, int sample, int max) = 0;
+  virtual bool SendUserActionToUMA(const std::string& action) = 0;
   virtual ~MetricsLibraryInterface() {}
 };
 
diff --git a/metrics/metrics_library_mock.h b/metrics/metrics_library_mock.h
index ba59c8f..9a5d59e 100644
--- a/metrics/metrics_library_mock.h
+++ b/metrics/metrics_library_mock.h
@@ -18,6 +18,7 @@
                                int min, int max, int nbuckets));
   MOCK_METHOD3(SendEnumToUMA, bool(const std::string& name, int sample,
                                    int max));
+  MOCK_METHOD1(SendUserActionToUMA, bool(const std::string& action));
 };
 
 #endif  // METRICS_LIBRARY_MOCK_H_