Send UMA recording state to TranslateRanker.

components/translate/core/browser/translate_ranker_impl.cc

Index: components/translate/core/browser/translate_ranker_impl.cc
diff --git a/components/translate/core/browser/translate_ranker_impl.cc b/components/translate/core/browser/translate_ranker_impl.cc
index d31d4718adabaa73fe5df4a2129f83f5a374f213..e8ad8825725d9829a48a76d8d72d32400f85cc2a 100644
--- a/components/translate/core/browser/translate_ranker_impl.cc
+++ b/components/translate/core/browser/translate_ranker_impl.cc
@@ -183,6 +183,8 @@ GURL TranslateRankerImpl::GetModelURL() {
 
 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 {