Allow TranslateRanker to override decisions taken by heuristics.

components/translate/core/browser/translate_ranker_impl.h

Index: components/translate/core/browser/translate_ranker_impl.h
diff --git a/components/translate/core/browser/translate_ranker_impl.h b/components/translate/core/browser/translate_ranker_impl.h
index 20bf4d4748b07f3606805dd251c2ea05c5dd9ea4..f79c3c801ca3f092bd02bf20df6be899be23225b 100644
--- a/components/translate/core/browser/translate_ranker_impl.h
+++ b/components/translate/core/browser/translate_ranker_impl.h
@@ -35,6 +35,7 @@ class TranslatePrefs;
 extern const base::Feature kTranslateRankerQuery;
 extern const base::Feature kTranslateRankerEnforcement;
 extern const base::Feature kTranslateRankerLogging;
+extern const base::Feature kTranslateRankerDecisionOverride;
 
 struct TranslateRankerFeatures {
   TranslateRankerFeatures();
@@ -91,6 +92,7 @@ class TranslateRankerImpl : public TranslateRanker {
   bool IsLoggingEnabled() override;
   bool IsQueryEnabled() override;
   bool IsEnforcementEnabled() override;
+  bool IsDecisionOverrideEnabled() override;
   int GetModelVersion() const override;
   bool ShouldOfferTranslation(const TranslatePrefs& translate_prefs,
                               const std::string& src_lang,