Add the new UMA key 'Translate.LocalesOnDisabledByPrefs'.

chrome/browser/translate/translate_manager_metrics.cc

 // 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.
 
 #include "chrome/browser/translate/translate_manager_metrics.h"
 
 #include "base/basictypes.h"
 #include "base/metrics/histogram.h"
+#include "base/metrics/sparse_histogram.h"
+#include "chrome/browser/language_usage_metrics.h"
 
 namespace {
 
 // Constant string values to indicate UMA names. All entries should have
 // a corresponding index in MetricsNameIndex and an entry in |kMetricsEntries|.
 const char kTranslateInitiationStatus[] =
     "Translate.InitiationStatus";
 const char kTranslateReportLanguageDetectionError[] =
     "Translate.ReportLanguageDetectionError";
 const char kTranslateServerReportedUnsupportedLanguage[] =
     "Translate.ServerReportedUnsupportedLanguage";
+const char kTranslateLocalesOnDisabledByPrefs[] =
+    "Translate.LocalesOnDisabledByPrefs";
 
 struct MetricsEntry {
   TranslateManagerMetrics::MetricsNameIndex index;
   const char* const name;
 };
 
 // This entry table should be updated when new UMA items are added.
 const MetricsEntry kMetricsEntries[] = {
   { TranslateManagerMetrics::UMA_INITIATION_STATUS,
     kTranslateInitiationStatus },
   { TranslateManagerMetrics::UMA_LANGUAGE_DETECTION_ERROR,
     kTranslateReportLanguageDetectionError },
   { TranslateManagerMetrics::UMA_SERVER_REPORTED_UNSUPPORTED_LANGUAGE,
     kTranslateServerReportedUnsupportedLanguage },
+  { TranslateManagerMetrics::UMA_LOCALES_ON_DISABLED_BY_PREFS,
+    kTranslateLocalesOnDisabledByPrefs },
 };
 
 COMPILE_ASSERT(arraysize(kMetricsEntries) == TranslateManagerMetrics::UMA_MAX,
                arraysize_of_kMetricsEntries_should_be_UMA_MAX);
 
 }  // namespace
 
 namespace TranslateManagerMetrics {
 
 void ReportInitiationStatus(InitiationStatusType type) {
   UMA_HISTOGRAM_ENUMERATION(kTranslateInitiationStatus,
                             type,
                             INITIATION_STATUS_MAX);
 }
 
 void ReportLanguageDetectionError() {
   UMA_HISTOGRAM_COUNTS(kTranslateReportLanguageDetectionError, 1);
 }
 
 void ReportUnsupportedLanguage() {
   UMA_HISTOGRAM_COUNTS(kTranslateServerReportedUnsupportedLanguage, 1);

[jar (doing other things), 2013/05/24 18:06:59]

Are you using this for a counter?

[hajimehoshi, 2013/05/27 01:13:26]

This will be fixed by https://chromiumcodereview.appspot.com/15311006/.  I'll
commit this CL after 15311006 is committed.

On 2013/05/24 18:06:59, jar wrote:

 }
 
+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)
       return kMetricsEntries[i].name;
   }
   NOTREACHED();
   return NULL;
 }
 
 }  // namespace TranslateManagerMetrics