Implement the 2016Q2 Translate UI designe spec out in

components/translate/core/browser/translate_ui_delegate.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 COMPONENTS_TRANSLATE_CORE_BROWSER_TRANSLATE_UI_DELEGATE_H_
 #define COMPONENTS_TRANSLATE_CORE_BROWSER_TRANSLATE_UI_DELEGATE_H_
 
 #include <stddef.h>
 
 #include <memory>
@@ skipping 101 matching lines @@
   void SetSiteBlacklist(bool value);
 
   // Returns true if the webpage in the current original language should be
   // translated into the current target language automatically.
   bool ShouldAlwaysTranslate();
 
   // Sets the value if the webpage in the current original language should be
   // translated into the current target language automatically.
   void SetAlwaysTranslate(bool value);
 
+  // Return true if "Always translate" should be checked by default in the

[msw, 2016/05/03 22:33:35]

optional nit: copy the comment from translate_bubble_model.h:
// Returns true if the Always Translate checkbox should be checked by default.

[ftang, 2016/05/03 23:55:42]

Done.

+  // bubble UI.
+  bool ShouldAlwaysTranslateBeCheckedByDefault();
+
  private:
   // Gets the host of the page being translated, or an empty string if no URL is
   // associated with the current page.
   std::string GetPageHost();
 
   TranslateDriver* translate_driver_;
   base::WeakPtr<TranslateManager> translate_manager_;
 
   // ISO code (en, fr...) -> displayable name in the current locale
   typedef std::pair<std::string, base::string16> LanguageNamePair;
@@ skipping 17 matching lines @@
 
   // The translation related preferences.
   std::unique_ptr<TranslatePrefs> prefs_;
 
   DISALLOW_COPY_AND_ASSIGN(TranslateUIDelegate);
 };
 
 }  // namespace translate
 
 #endif  // COMPONENTS_TRANSLATE_CORE_BROWSER_TRANSLATE_UI_DELEGATE_H_