metrics: Add SendUserActionToUMA() to MetricsLibraryMock.

metrics_library.h

 // Copyright (c) 2010 The Chromium OS 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 METRICS_LIBRARY_H_
 #define METRICS_LIBRARY_H_
 
 #include <sys/types.h>
 #include <string>
 
 #include <gtest/gtest_prod.h>  // for FRIEND_TEST
 
 class MetricsLibraryInterface {
  public:
   virtual void Init() = 0;
   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() {}
 };
 
 // Library used to send metrics to both Autotest and Chrome/UMA.
 class MetricsLibrary : public MetricsLibraryInterface {
  public:
   MetricsLibrary();
 
   // Initializes the library.
   void Init();
@@ skipping 89 matching lines @@
   static time_t cached_enabled_time_;
 
   // Cached state of whether or not metrics were enabled.
   static bool cached_enabled_;
 
   const char* uma_events_file_;
   const char* consent_file_;
 };
 
 #endif  // METRICS_LIBRARY_H_