Add the new UMA key 'Translate.LocalesOnDisabledByPrefs'.

chrome/browser/translate/translate_manager_metrics.cc

Index: chrome/browser/translate/translate_manager_metrics.cc
diff --git a/chrome/browser/translate/translate_manager_metrics.cc b/chrome/browser/translate/translate_manager_metrics.cc
index 0098c74a4f0a140cdced48d33318e0dab20b5ab1..eaee2a28d5ece34ee8a27a6cb73defa43b15b333 100644
--- a/chrome/browser/translate/translate_manager_metrics.cc
+++ b/chrome/browser/translate/translate_manager_metrics.cc
@@ -23,6 +23,8 @@ const char kTranslateServerReportedUnsupportedLanguage[] =
     "Translate.ServerReportedUnsupportedLanguage";
 const char kTranslateUnsupportedLanguageAtInitiation[] =
     "Translate.UnsupportedLanguageAtInitiation";
+const char kTranslateLocalesOnDisabledByPrefs[] =
+    "Translate.LocalesOnDisabledByPrefs";
 
 struct MetricsEntry {
   TranslateManagerMetrics::MetricsNameIndex index;
@@ -39,6 +41,8 @@ const MetricsEntry kMetricsEntries[] = {
     kTranslateServerReportedUnsupportedLanguage },
   { TranslateManagerMetrics::UMA_UNSUPPORTED_LANGUAGE_AT_INITIATION,
     kTranslateUnsupportedLanguageAtInitiation },
+  { TranslateManagerMetrics::UMA_LOCALES_ON_DISABLED_BY_PREFS,
+    kTranslateLocalesOnDisabledByPrefs },
 };
 
 COMPILE_ASSERT(arraysize(kMetricsEntries) == TranslateManagerMetrics::UMA_MAX,
@@ -68,6 +72,11 @@ void ReportUnsupportedLanguageAtInitiation(const std::string& language) {
                               language_code);
 }
 
+void ReportLocalesOnDisabledByPrefs(const std::string& locale) {
+  UMA_HISTOGRAM_SPARSE_SLOWLY(kTranslateLocalesOnDisabledByPrefs,
+                              LanguageUsageMetrics::ToLanguageCode(locale));
+}
+
 const char* GetMetricsName(MetricsNameIndex index) {
   for (size_t i = 0; i < arraysize(kMetricsEntries); ++i) {
     if (kMetricsEntries[i].index == index)