Send TranslateEventProtos to UMA.

components/translate/core/browser/translate_ranker.h

Index: components/translate/core/browser/translate_ranker.h
diff --git a/components/translate/core/browser/translate_ranker.h b/components/translate/core/browser/translate_ranker.h
index 6444b9b62d9ed25c0fcb7ff19643d1d40129401b..7d039ab68edd4699851e620efae8bf53ec47db33 100644
--- a/components/translate/core/browser/translate_ranker.h
+++ b/components/translate/core/browser/translate_ranker.h
@@ -16,6 +16,10 @@ namespace chrome_intelligence {
 class TranslateRankerModel;
 }
 
+namespace metrics {
+class TranslateEventProto;
+}
+
 namespace translate {
 
 class TranslatePrefs;
@@ -59,6 +63,15 @@ class TranslateRanker {
   // Returns the model version (a date stamp) or 0 if there is no valid model.
   int GetModelVersion() const;
 
+  // Caches the translate event.
+  void RecordTranslateEvent(
+      const metrics::TranslateEventProto& translate_event);
+
+  // Transfers cached translate events to the given vector pointer and clears
+  // the cache.
+  void FlushTranslateEvents(
+      std::vector<metrics::TranslateEventProto>* translate_events);
+
  private:
   // The ID which is assigned to the underlying URLFetcher.
   static constexpr int kFetcherId = 2;
@@ -91,6 +104,9 @@ class TranslateRanker {
   // Used for UMA reporting of timing.
   base::Time download_start_time_;
 
+  // Saved cache of translate event protos.
+  std::vector<metrics::TranslateEventProto> translate_events_cache_;
+
   FRIEND_TEST_ALL_PREFIXES(TranslateRankerTest, CalculateScore);
 
   friend struct base::DefaultSingletonTraits<TranslateRanker>;