HistoryService::Init() receives the list of languages

chrome/browser/history/history_service.h

Index: chrome/browser/history/history_service.h
diff --git a/chrome/browser/history/history_service.h b/chrome/browser/history/history_service.h
index c14dafc4231a1b1fc917df61fe56fc167bde56a1..d26c5ac493b4ac1621d6da838e54caa548c0cf1a 100644
--- a/chrome/browser/history/history_service.h
+++ b/chrome/browser/history/history_service.h
@@ -6,6 +6,7 @@
 #define CHROME_BROWSER_HISTORY_HISTORY_SERVICE_H_
 
 #include <set>
+#include <string>
 #include <vector>
 
 #include "base/basictypes.h"
@@ -90,7 +91,7 @@ class HistoryService : public syncer::SyncableService,
 
   // Must call Init after construction. The |history::HistoryClient| object
   // must be valid for the whole lifetime of |HistoryService|.
-  explicit HistoryService(history::HistoryClient* client, Profile* profile);
+  HistoryService(history::HistoryClient* client, Profile* profile);
   // The empty constructor is provided only for testing.
   HistoryService();
 
@@ -99,8 +100,9 @@ class HistoryService : public syncer::SyncableService,
   // Initializes the history service, returning true on success. On false, do
   // not call any other functions. The given directory will be used for storing
   // the history files.

[droger, 2015/02/04 16:42:46]

Should we comment about the expected format of the string?
I assume this is a comma-separated list?

-  bool Init(const history::HistoryDatabaseParams& history_database_params) {
-    return Init(false, history_database_params);
+  bool Init(const std::string& languages,
+            const history::HistoryDatabaseParams& history_database_params) {
+    return Init(false, languages, history_database_params);
   }
 
   // Triggers the backend to load if it hasn't already, and then returns whether
@@ -559,6 +561,7 @@ class HistoryService : public syncer::SyncableService,
   // Low-level Init().  Same as the public version, but adds a |no_db| parameter
   // that is only set by unittests which causes the backend to not init its DB.
   bool Init(bool no_db,
+            const std::string& languages,
             const history::HistoryDatabaseParams& history_database_params);
 
   // Called by the HistoryURLProvider class to schedule an autocomplete, it