Translate: add UMA to measure duration time of infobar user action

chrome/renderer/translate/translate_helper_metrics.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 CHROME_RENDERER_TRANSLATE_TRANSLATE_HELPER_METRICS_H_
 #define CHROME_RENDERER_TRANSLATE_TRANSLATE_HELPER_METRICS_H_
 
 #include <string>
 
 #include "base/time.h"
 
 namespace TranslateHelperMetrics {
 
 // An indexing type to query each UMA entry name via GetMetricsName() function.
 // Note: The implementation of GetMetricsName() should be updated when a new
 // entry is added here.
 enum MetricsNameIndex {
   UMA_LANGUAGE_DETECTION,
   UMA_CONTENT_LANGUAGE,
   UMA_LANGUAGE_VERIFICATION,
   UMA_TIME_TO_BE_READY,
   UMA_TIME_TO_LOAD,
   UMA_TIME_TO_TRANSLATE,
+  UMA_USER_ACTION_DURATION,
   UMA_MAX,
 };
 
 // A page may provide a Content-Language HTTP header or a META tag.
 // TranslateHelper checks if a server provides a valid Content-Language.
 enum ContentLanguageType {
   CONTENT_LANGUAGE_NOT_PROVIDED,
   CONTENT_LANGUAGE_VALID,
   CONTENT_LANGUAGE_INVALID,
   CONTENT_LANGUAGE_MAX,
@@ skipping 22 matching lines @@
 
 // Called when the Translate Element library is ready.
 void ReportTimeToBeReady(double time_in_msec);
 
 // Called when the Translate Element library is loaded.
 void ReportTimeToLoad(double time_in_msec);
 
 // Called when a page translation is finished.
 void ReportTimeToTranslate(double time_in_msec);
 
+// Called when a translation is triggered.
+void ReportUserActionDuration(base::TimeTicks begin, base::TimeTicks end);
+
 #if defined(ENABLE_LANGUAGE_DETECTION)
 
 // Called when CLD detects page language.
 void ReportLanguageDetectionTime(base::TimeTicks begin, base::TimeTicks end);
 
 #endif  // defined(ENABLE_LANGUAGE_DETECTION)
 
 // Gets UMA name for an entry specified by |index|.
 const char* GetMetricsName(MetricsNameIndex index);
 
 }  // namespace TranslateHelperMetrics
 
 #endif  // CHROME_RENDERER_TRANSLATE_TRANSLATE_HELPER_METRICS_H_