Create an AutofillBackend interface

components/webdata/common/web_data_service_backend.h

 // 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.
 
 #ifndef COMPONENTS_WEBDATA_COMMON_WEB_DATA_SERVICE_BACKEND_H_
 #define COMPONENTS_WEBDATA_COMMON_WEB_DATA_SERVICE_BACKEND_H_
 
 #include "base/basictypes.h"
 #include "base/callback_forward.h"
 #include "base/compiler_specific.h"
@@ skipping 11 matching lines @@
 class WebDataRequestManager;
 
 namespace tracked_objects {
 class Location;
 }
 
 // WebDataServiceBackend handles all database tasks posted by
 // WebDatabaseService. It is refcounted to allow asynchronous destruction on the
 // DB thread.
 
+// TODO(caitkp): Rename this class to WebDatabaseBackend.
+
 class WebDataServiceBackend
     : public base::RefCountedThreadSafe<
           WebDataServiceBackend,
           content::BrowserThread::DeleteOnDBThread> {
  public:
   class Delegate {
     public:
     virtual ~Delegate() {}
 
     // Invoked when the backend has finished loading the db.
@@ skipping 13 matching lines @@
   // Opens the database file from the profile path if an init has not yet been
   // attempted. Separated from the constructor to ease construction/destruction
   // of this object on one thread but database access on the DB thread. Returns
   // the status of the database.
   sql::InitStatus LoadDatabaseIfNecessary();
 
   // Shuts down database. |should_reinit| tells us whether or not it should be
   // possible to re-initialize the DB after the shutdown.
   void ShutdownDatabase(bool should_reinit);
 
-  // Task wrappers to run database tasks.
+  // Task wrappers to update requests and and notify |request_manager_|. These
+  // are used in cases where the request is being made from the UI thread and an
+  // asyncronous callback is required to notify the client of |request|'s
+  // completion.
   void DBWriteTaskWrapper(
       const WebDatabaseService::WriteTask& task,
       scoped_ptr<WebDataRequest> request);
   void DBReadTaskWrapper(
       const WebDatabaseService::ReadTask& task,
       scoped_ptr<WebDataRequest> request);
 
+  // Task runners to run database tasks

[Ilya Sherman, 2013/05/10 00:08:00]

nit: Please end the sentence with a period.

+  void ExecuteWriteTask(const WebDatabaseService::WriteTask& task);
+  scoped_ptr<WDTypedResult> ExecuteReadTask(
+      const WebDatabaseService::ReadTask& task);
+
   const scoped_refptr<WebDataRequestManager>& request_manager() {
     return request_manager_;
   }
 
   WebDatabase* database() { return db_.get(); }
 
  private:
   friend struct content::BrowserThread::DeleteOnThread<
       content::BrowserThread::DB>;
   friend class base::DeleteHelper<WebDataServiceBackend>;
@@ skipping 29 matching lines @@
   // fails), used to avoid continually trying to reinit if the db init fails.
   bool init_complete_;
 
   // Delegate. See the class definition above for more information.
   scoped_ptr<Delegate> delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(WebDataServiceBackend);
 };
 
 #endif  // COMPONENTS_WEBDATA_COMMON_WEB_DATA_SERVICE_BACKEND_H_