Send TranslateEventProtos to UMA.

components/translate/core/browser/translate_ranker.cc

Index: components/translate/core/browser/translate_ranker.cc
diff --git a/components/translate/core/browser/translate_ranker.cc b/components/translate/core/browser/translate_ranker.cc
index 358675025ec78fbedfcdddd5dd152d3bb0367fef..5d6b6b03992ade9e5a7e30e01d5a9dce6226b48b 100644
--- a/components/translate/core/browser/translate_ranker.cc
+++ b/components/translate/core/browser/translate_ranker.cc
@@ -12,6 +12,7 @@
 #include "base/metrics/histogram_macros.h"
 #include "base/profiler/scoped_tracker.h"
 #include "base/strings/string_util.h"
+#include "components/metrics/proto/translate_event.pb.h"
 #include "components/translate/core/browser/proto/translate_ranker_model.pb.h"
 #include "components/translate/core/browser/translate_download_manager.h"
 #include "components/translate/core/browser/translate_prefs.h"
@@ -86,6 +87,9 @@ const base::Feature kTranslateRankerQuery{"TranslateRankerQuery",
 const base::Feature kTranslateRankerEnforcement{
     "TranslateRankerEnforcement", base::FEATURE_DISABLED_BY_DEFAULT};
 
+const base::Feature kTranslateRankerLogging{"TranslateRankerLogging",
+                                            base::FEATURE_DISABLED_BY_DEFAULT};
+
 TranslateRanker::~TranslateRanker() {}
 
 // static
@@ -94,6 +98,11 @@ bool TranslateRanker::IsEnabled() {
 }
 
 // static
+bool TranslateRanker::IsLoggingEnabled() {
+  return base::FeatureList::IsEnabled(kTranslateRankerLogging);
+}
+
+// static
 TranslateRanker* TranslateRanker::GetInstance() {
   return base::Singleton<TranslateRanker>::get();
 }
@@ -282,4 +291,18 @@ void TranslateRanker::ParseModel(int /* id */,
   model_fetcher_.reset();
 }
 
+void TranslateRanker::FlushTranslateEvents(
+    std::vector<metrics::TranslateEventProto>* translate_events) {
+  if (IsLoggingEnabled()) {
+    translate_events->swap(translate_events_cache_);
+    translate_events_cache_.clear();
+  }
+}
+
+void TranslateRanker::RecordTranslateEvent(
+    const metrics::TranslateEventProto& translate_event) {
+  if (IsLoggingEnabled())
+    translate_events_cache_.push_back(translate_event);
+}
+
 }  // namespace translate