Allow TranslateRanker to override decisions taken by heuristics.

components/translate/core/browser/translate_ranker_impl.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/translate/core/browser/translate_ranker_impl.h"
 
 #include <cmath>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 64 matching lines @@
 
 const base::Feature kTranslateRankerQuery{"TranslateRankerQuery",
                                           base::FEATURE_DISABLED_BY_DEFAULT};
 
 const base::Feature kTranslateRankerEnforcement{
     "TranslateRankerEnforcement", base::FEATURE_DISABLED_BY_DEFAULT};
 
 const base::Feature kTranslateRankerLogging{"TranslateRankerLogging",
                                             base::FEATURE_DISABLED_BY_DEFAULT};
 
+const base::Feature kTranslateRankerDecisionOverride{
+    "TranslateRankerDecisionOverride", base::FEATURE_DISABLED_BY_DEFAULT};
+
 TranslateRankerFeatures::TranslateRankerFeatures() {}
 
 TranslateRankerFeatures::TranslateRankerFeatures(int accepted,
                                                  int denied,
                                                  int ignored,
                                                  const std::string& src,
                                                  const std::string& dst,
                                                  const std::string& cntry,
                                                  const std::string& locale)
     : accepted_count(accepted),
@@ skipping 80 matching lines @@
 
 bool TranslateRankerImpl::IsLoggingEnabled() {
   return base::FeatureList::IsEnabled(kTranslateRankerLogging);
 }
 
 bool TranslateRankerImpl::IsQueryEnabled() {
   return base::FeatureList::IsEnabled(kTranslateRankerQuery);
 }
 
 bool TranslateRankerImpl::IsEnforcementEnabled() {
-  return base::FeatureList::IsEnabled(kTranslateRankerEnforcement);
+  return base::FeatureList::IsEnabled(kTranslateRankerEnforcement) ||
+         IsDecisionOverrideEnabled();
+}
+
+bool TranslateRankerImpl::IsDecisionOverrideEnabled() {
+  return base::FeatureList::IsEnabled(
+      translate::kTranslateRankerDecisionOverride);

[Alexei Svitkine (slow), 2017/03/06 22:08:20]

Nit: Remove translate:: since it's already in this namespace.

 }
 
 int TranslateRankerImpl::GetModelVersion() const {
   return model_ ? model_->proto().translate().version() : 0;
 }
 
 bool TranslateRankerImpl::ShouldOfferTranslation(
     const TranslatePrefs& translate_prefs,
     const std::string& src_lang,
     const std::string& dst_lang) {
@@ skipping 77 matching lines @@
   model_ = std::move(model);
 }
 
 }  // namespace translate
 
 std::ostream& operator<<(std::ostream& stream,
                          const translate::TranslateRankerFeatures& features) {
   features.WriteTo(stream);
   return stream;
 }