Send UMA recording state to TranslateRanker.

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 165 matching lines @@
         kTranslateRankerQuery, switches::kTranslateRankerModelURL);
   }
 
   DVLOG(3) << switches::kTranslateRankerModelURL << " = " << raw_url;
 
   return GURL(raw_url);
 }
 
 void TranslateRankerImpl::EnableLogging(bool value) {
   is_logging_enabled_ = value;
+  if (!is_logging_enabled_)

[groby-ooo-7-16, 2017/06/07 16:27:21]

Don't you want to clear on every edge transition? As a fallback in case the
event_cache_ got populated due to a bug?

[hamelphi, 2017/06/08 20:27:58]

Good point. Done.

+    event_cache_.clear();
 }
 
 uint32_t TranslateRankerImpl::GetModelVersion() const {
   return model_ ? model_->proto().translate().version() : 0;
 }
 
 bool TranslateRankerImpl::ShouldOfferTranslation(
     metrics::TranslateEventProto* translate_event) {
   DCHECK(sequence_checker_.CalledOnValidSequence());
   // The ranker is a gate in the "show a translation prompt" flow. To retain
@@ skipping 169 matching lines @@
   }
 }
 
 }  // namespace translate
 
 std::ostream& operator<<(std::ostream& stream,
                          const translate::TranslateRankerFeatures& features) {
   features.WriteTo(stream);
   return stream;
 }