Add a unit test for translation event logging.

chrome/browser/translate/chrome_translate_client.h

 // Copyright 2014 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.
 
 #ifndef CHROME_BROWSER_TRANSLATE_CHROME_TRANSLATE_CLIENT_H_
 #define CHROME_BROWSER_TRANSLATE_CHROME_TRANSLATE_CLIENT_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 103 matching lines @@
                         const std::string& translated_lang,
                         translate::TranslateErrors::Type error_type) override;
 
  private:
   explicit ChromeTranslateClient(content::WebContents* web_contents);
   friend class content::WebContentsUserData<ChromeTranslateClient>;
   FRIEND_TEST_ALL_PREFIXES(ChromeTranslateClientTest,
                            LanguageEventShouldRecord);
   FRIEND_TEST_ALL_PREFIXES(ChromeTranslateClientTest,
                            LanguageEventShouldNotRecord);
+  FRIEND_TEST_ALL_PREFIXES(ChromeTranslateClientTest,
+                           TranslationEventShouldRecord);
+  FRIEND_TEST_ALL_PREFIXES(ChromeTranslateClientTest,
+                           TranslationEventShouldNotRecord);
 
   // content::WebContentsObserver implementation.
   void WebContentsDestroyed() override;
 
   // Shows the translate bubble.
   ShowTranslateBubbleResult ShowBubble(
       translate::TranslateStep step,
       translate::TranslateErrors::Type error_type);
 
   translate::ContentTranslateDriver translate_driver_;
   std::unique_ptr<translate::TranslateManager> translate_manager_;
 
   // Model to be notified about detected language of every page visited. Not
   // owned here.
   translate::LanguageModel* language_model_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeTranslateClient);
 };
 
 #endif  // CHROME_BROWSER_TRANSLATE_CHROME_TRANSLATE_CLIENT_H_