add experimental param to control the triggering threshold to default Always Translate checked

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 8c803a5e743deb63c5dcb75bb4cb395ea10a24f8..5cfb712160d0d9cdf097d30457f3c0e418c6c3b8 100644
--- a/components/translate/core/browser/translate_prefs.h
+++ b/components/translate/core/browser/translate_prefs.h
@@ -35,6 +35,13 @@ namespace translate {
 // Feature flag for "Translate UI 2016 Q2" project.
 extern const base::Feature kTranslateUI2016Q2;
 
+// The trail (study) name in finch study config.

[groby-ooo-7-16, 2016/06/28 17:35:20]

trial :)

[ftang, 2016/06/28 21:51:12]

Done.

+extern const char kTranslateUI2016Q2TrialName[];
+
+// The name of the parameter for the number of translation trigger the "Always

[groby-ooo-7-16, 2016/06/28 17:35:20]

....for the number of translations, *after which* the "Always....

[ftang, 2016/06/28 21:51:12]

Done.

+// Translate" checkbox default to checked.
+extern const char kAlwaysTranslateOfferThreshold[];
+
 class TranslateAcceptLanguages;
 
 // Allows updating denial times for a specific language while maintaining the
@@ -157,6 +164,7 @@ class TranslatePrefs {
                             const std::string& language);
   bool ShouldAutoTranslate(const std::string& original_language,
                            std::string* target_language);
+
   static void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
   static void MigrateUserPrefs(PrefService* user_prefs,
                                const char* accept_languages_pref);