Added translation policy API.

components/translate/core/browser/translate_ui_delegate.h

Index: components/translate/core/browser/translate_ui_delegate.h
diff --git a/components/translate/core/browser/translate_ui_delegate.h b/components/translate/core/browser/translate_ui_delegate.h
index 230a68cd6c973319c5dc5c44c80408990aae1294..55f7c2bb1900b47ba7ce9d0e8cbae685a4a04492 100644
--- a/components/translate/core/browser/translate_ui_delegate.h
+++ b/components/translate/core/browser/translate_ui_delegate.h
@@ -77,6 +77,9 @@ class TranslateUIDelegate {
   // Returns the ISO code for the language at |index|.
   std::string GetLanguageCodeAt(size_t index) const;
 
+  // Returns the index of |language_code|.
+  size_t GetLanguageIndex(const std::string& language_code);
+
   // Returns the displayable name for the language at |index|.
   base::string16 GetLanguageNameAt(size_t index) const;
 
@@ -101,15 +104,27 @@ class TranslateUIDelegate {
   // Returns true if the current language is blocked.
   bool IsLanguageBlocked();
 
+  // Returns true if |language_code| is blocked.
+  bool IsLanguageBlocked(const std::string& language_code);
+
   // Sets the value if the current language is blocked.
   void SetLanguageBlocked(bool value);
 
+  // Sets the value if the |language_code| is blocked.
+  void SetLanguageBlocked(bool value, const std::string& language_code);
+
   // Returns true if the current webpage is blacklisted.
   bool IsSiteBlacklisted();
 
+  // Returns true if |page_host| is blacklisted.
+  bool IsSiteBlacklisted(const std::string& page_host);
+
   // Sets the value if the current webpage is blacklisted.
   void SetSiteBlacklist(bool value);
 
+  // Sets the value if the |page_host| is blacklisted.
+  void SetSiteBlacklist(bool value, const std::string& page_host);
+
   // Returns true if the webpage in the current original language should be
   // translated into the current target language automatically.
   bool ShouldAlwaysTranslate();
@@ -118,6 +133,18 @@ class TranslateUIDelegate {
   // translated into the current target language automatically.
   void SetAlwaysTranslate(bool value);
 
+  // Sets the value if the webpage in the |from_language| should be

[Hiroshi Ichikawa, 2017/05/11 04:59:44]

Optional: Thanks, it's clearer now. But I feel the comment is still a bit hard
to understand. How about something like this, if you prefer:

If |value| is true, update the preference to always translate |from_languge| to
|to_language| without prompting. If it is called multiple times for the same
|from_language|, the last specified |to_language| is used.

If |value| is false, update the preference not to always translate
|from_language|. |target_language| is ignored.

[jzw1, 2017/05/11 07:23:46]

Done.

+  // translated into the |to_language| automatically. Every |from_language| will
+  // only store the last |to_language| as the target. |to_language| is ignored
+  // when |value| is false.
+  void SetAlwaysTranslate(bool value,
+                          const std::string& from_language,
+                          const std::string& to_language);
+
+  // Returns the language to always translate |from_language| to, or empty
+  // string if no such language has been set.
+  std::string GetAlwaysTranslateToLanguage(const std::string& from_language);
+
   // Returns true if the Always Translate checkbox should be checked by default.
   bool ShouldAlwaysTranslateBeCheckedByDefault();