using ulp to improve TranslateManager GetTargetLanguage() and InitiateTranslation()

components/translate/core/browser/translate_prefs.h

Index: components/translate/core/browser/translate_prefs.h
diff --git a/components/translate/core/browser/translate_prefs.h b/components/translate/core/browser/translate_prefs.h
index d03e2590061debcd9317873d50af269330d1de37..8a34621be00b329392259b5aa9b4a25b60944f89 100644
--- a/components/translate/core/browser/translate_prefs.h
+++ b/components/translate/core/browser/translate_prefs.h
@@ -78,6 +78,7 @@ class DenialTimeUpdate {
 // It is assumed that |prefs_| is alive while this instance is alive.
 class TranslatePrefs {
  public:
+  static const char kPrefLanguageProfile[];
   static const char kPrefTranslateSiteBlacklist[];
   static const char kPrefTranslateWhitelists[];
   static const char kPrefTranslateDeniedCount[];
@@ -165,6 +166,17 @@ class TranslatePrefs {
   bool ShouldAutoTranslate(const std::string& original_language,
                            std::string* target_language);
 
+  // Language and probability pair.
+  typedef std::pair<std::string, double> LanguageAndProbability;

[Lei Zhang, 2016/11/17 07:03:28]

nit: using LanguageAndProbability = std::pair... is preferred.

+  typedef std::vector<LanguageAndProbability> LanguageAndProbabilityList;
+
+  // Output the User Profile Profile's (ULP) "reading list" into |list| as
+  // ordered list of <string, double> pair, sorted by the double in decreasing
+  // order. Return the confidence of the list or 0.0 if there no ULP "reading
+  // list".
+  double GetReadingFromUserLanguageProfile(
+      LanguageAndProbabilityList* list) const;
+
   static void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
   static void MigrateUserPrefs(PrefService* user_prefs,
                                const char* accept_languages_pref);