Implement the 2016Q2 Translate UI designe spec out in

chrome/browser/ui/translate/translate_bubble_model.h

 // Copyright 2013 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_UI_TRANSLATE_TRANSLATE_BUBBLE_MODEL_H_
 #define CHROME_BROWSER_UI_TRANSLATE_TRANSLATE_BUBBLE_MODEL_H_
 
 #include <string>
 
 #include "base/strings/string16.h"
@@ skipping 64 matching lines @@
   virtual void SetNeverTranslateLanguage(bool value) = 0;
 
   // Sets the value if the user doesn't want to have the page translated the
   // current page's domain.
   virtual void SetNeverTranslateSite(bool value) = 0;
 
   // Returns true if the webpage in the current original language should be
   // translated into the current target language automatically.
   virtual bool ShouldAlwaysTranslate() const = 0;
 
+  // Returns true if the Always Translate checkbox should be checked by default.
+  virtual bool ShouldAlwaysTranslateBeCheckedByDefault() const = 0;
+
   // Sets the value if the webpage in the current original language should be
   // translated into the current target language automatically.
   virtual void SetAlwaysTranslate(bool value) = 0;
 
   // Starts translating the current page.
   virtual void Translate() = 0;
 
   // Reverts translation.
   virtual void RevertTranslation() = 0;
 
   // Called when the translate bubble is closed. Allows final cleanup and
   // notification of delegates.
   virtual void OnBubbleClosing() = 0;
 
   // Returns true if the page is translated in the currently selected source
   // and target language.
   virtual bool IsPageTranslatedInCurrentLanguages() const = 0;
 };
 
 #endif  // CHROME_BROWSER_UI_TRANSLATE_TRANSLATE_BUBBLE_MODEL_H_