Create an AutofillBackend interface

components/webdata/common/web_data_service_backend.cc

Index: components/webdata/common/web_data_service_backend.cc
diff --git a/components/webdata/common/web_data_service_backend.cc b/components/webdata/common/web_data_service_backend.cc
index 3b945b0b540f721304917c9d135b52a16689f890..b849b7f191f75dbc06325a8b73f6294deaf87525 100644
--- a/components/webdata/common/web_data_service_backend.cc
+++ b/components/webdata/common/web_data_service_backend.cc
@@ -92,6 +92,15 @@ void WebDataServiceBackend::DBReadTaskWrapper(
   request_manager_->RequestCompleted(request.Pass());
 }
 
+void WebDataServiceBackend::GetDatabaseAsync(
+    const WebDatabaseService::DBCallback& callback) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::DB));
+  if (!db_ || init_status_ != sql::INIT_OK)
+    callback.Run(NULL);
+  else
+    callback.Run(db_.get());

[Ilya Sherman, 2013/05/07 00:02:43]

This code looks synchronous to me...  What makes the method async?

[Jói, 2013/05/07 09:56:10]

Yeah, I stumbled on that one as well, so it definitely needs a bit of extra
documentation. The trick seems to be that it is called from
WebDatabaseService::GetDatabaseOnDB which calls it via a PostTask to the DB
thread.

+}
+
 WebDataServiceBackend::~WebDataServiceBackend() {
   ShutdownDatabase(false);
 }