Send UMA recording state to TranslateRanker.

chrome/browser/translate/translate_ranker_metrics_provider.h

Index: chrome/browser/translate/translate_ranker_metrics_provider.h
diff --git a/chrome/browser/translate/translate_ranker_metrics_provider.h b/chrome/browser/translate/translate_ranker_metrics_provider.h
index 7490cab99dcf4c6d12f4b88e6c82580aaceead3a..52f016a129f0a5a4c6d5e05df66ee584c2fb73e9 100644
--- a/chrome/browser/translate/translate_ranker_metrics_provider.h
+++ b/chrome/browser/translate/translate_ranker_metrics_provider.h
@@ -15,10 +15,15 @@ class TranslateRankerMetricsProvider : public metrics::MetricsProvider {
   TranslateRankerMetricsProvider() {}
   ~TranslateRankerMetricsProvider() override {}
 
- private:
   // From metrics::MetricsProvider...
   void ProvideGeneralMetrics(
       metrics::ChromeUserMetricsExtension* uma_proto) override;
+  void OnRecordingEnabled() override;
+  void OnRecordingDisabled() override;
+
+ private:
+  // Enables or disables the logging for translate ranker.
+  void SetLoggingState(bool logging_enabled);
 
   DISALLOW_COPY_AND_ASSIGN(TranslateRankerMetricsProvider);
 };