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 5b11d30548b4e0b698074cad0e3ff7a83357eff0..92416b5ccc9b56e706b5c72fe614b843bcbd9ace 100644
--- a/chrome/browser/translate/translate_manager_metrics.cc
+++ b/chrome/browser/translate/translate_manager_metrics.cc
@@ -6,6 +6,8 @@
 
 #include "base/basictypes.h"
 #include "base/metrics/histogram.h"
+#include "base/metrics/sparse_histogram.h"
+#include "chrome/browser/language_usage_metrics.h"
 
 namespace {
 
@@ -17,6 +19,8 @@ const char kTranslateReportLanguageDetectionError[] =
     "Translate.ReportLanguageDetectionError";
 const char kTranslateServerReportedUnsupportedLanguage[] =
     "Translate.ServerReportedUnsupportedLanguage";
+const char kTranslateLocalesOnDisabledByPrefs[] =
+    "Translate.LocalesOnDisabledByPrefs";
 
 struct MetricsEntry {
   TranslateManagerMetrics::MetricsNameIndex index;
@@ -31,6 +35,8 @@ const MetricsEntry kMetricsEntries[] = {
     kTranslateReportLanguageDetectionError },
   { TranslateManagerMetrics::UMA_SERVER_REPORTED_UNSUPPORTED_LANGUAGE,
     kTranslateServerReportedUnsupportedLanguage },
+  { TranslateManagerMetrics::UMA_LOCALES_ON_DISABLED_BY_PREFS,
+    kTranslateLocalesOnDisabledByPrefs },
 };
 
 COMPILE_ASSERT(arraysize(kMetricsEntries) == TranslateManagerMetrics::UMA_MAX,
@@ -54,6 +60,11 @@ 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)