Create an AutofillBackend interface

components/webdata/common/web_database_service.cc

 // Copyright 2013 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.
 
 #include "components/webdata/common/web_database_service.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "components/webdata/common/web_data_request_manager.h"
 #include "components/webdata/common/web_data_results.h"
@@ skipping 66 matching lines @@
 
 void WebDatabaseService::ShutdownDatabase() {
   if (!wds_backend_)
     return;
   weak_ptr_factory_.InvalidateWeakPtrs();
   BrowserThread::PostTask(BrowserThread::DB, FROM_HERE,
       Bind(&WebDataServiceBackend::ShutdownDatabase,
            wds_backend_, false));
 }
 
+void WebDatabaseService::GetDatabaseOnDB(const DBCallback& callback) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  BrowserThread::PostTask(BrowserThread::DB, FROM_HERE,
+      Bind(&WebDataServiceBackend::GetDatabaseAsync, wds_backend_, callback));
+}
+
 WebDatabase* WebDatabaseService::GetDatabaseOnDB() const {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::DB));
   if (!wds_backend_)
     return NULL;
   return wds_backend_->database();
 }
 
 void WebDatabaseService::ScheduleDBTask(
     const tracked_objects::Location& from_here,
     const WriteTask& task) {
@@ skipping 53 matching lines @@
     FOR_EACH_OBSERVER(WebDatabaseObserver,
                       observer_list_,
                       WebDatabaseLoaded());
   } else {
     // Notify that the database load failed.
     FOR_EACH_OBSERVER(WebDatabaseObserver,
                       observer_list_,
                       WebDatabaseLoadFailed(status));
   }
 }