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

chrome/renderer/translate/translate_helper_metrics.cc

Index: chrome/renderer/translate/translate_helper_metrics.cc
diff --git a/chrome/renderer/translate/translate_helper_metrics.cc b/chrome/renderer/translate/translate_helper_metrics.cc
index 308100ae1d000ac67f3e37397dfa72ab3ae6ff3e..25bdf536f57bd82dafc1fc15418a2feaeb9fdc52 100644
--- a/chrome/renderer/translate/translate_helper_metrics.cc
+++ b/chrome/renderer/translate/translate_helper_metrics.cc
@@ -17,6 +17,7 @@ const char kTranslateLanguageVerification[] = "Translate.LanguageVerification";
 const char kTranslateTimeToBeReady[] = "Translate.TimeToBeReady";
 const char kTranslateTimeToLoad[] = "Translate.TimeToLoad";
 const char kTranslateTimeToTranslate[] = "Translate.TimeToTranslate";
+const char kTranslateUserActionDuration[] = "Translate.UserActionDuration";
 
 struct MetricsEntry {
   TranslateHelperMetrics::MetricsNameIndex index;
@@ -37,6 +38,8 @@ const MetricsEntry kMetricsEntries[] = {
     kTranslateTimeToLoad },
   { TranslateHelperMetrics::UMA_TIME_TO_TRANSLATE,
     kTranslateTimeToTranslate },
+  { TranslateHelperMetrics::UMA_USER_ACTION_DURATION,
+    kTranslateUserActionDuration },
 };
 
 COMPILE_ASSERT(arraysize(kMetricsEntries) == TranslateHelperMetrics::UMA_MAX,
@@ -87,6 +90,10 @@ void ReportTimeToTranslate(double time_in_msec) {
       base::TimeDelta::FromMicroseconds(time_in_msec * 1000.0));
 }
 
+void ReportUserActionDuration(base::TimeTicks begin, base::TimeTicks end) {
+  UMA_HISTOGRAM_LONG_TIMES(kTranslateUserActionDuration, end - begin);
+}
+
 #if defined(ENABLE_LANGUAGE_DETECTION)
 
 void ReportLanguageDetectionTime(base::TimeTicks begin, base::TimeTicks end) {