Make document service an interface

chrome/browser/chromeos/gdata/gdata_file_system.cc

 // Copyright (c) 2012 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 "chrome/browser/chromeos/gdata/gdata_file_system.h"
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/json/json_writer.h"
@@ skipping 390 matching lines @@
 
   // Should be created from the file browser extension API on UI thread.
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 }
 
 GDataFileSystem::~GDataFileSystem() {
   // Should be deleted as part of Profile on UI thread.
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 }
 
+void GDataFileSystem::ReplaceDocumentsService(
+    scoped_ptr<DocumentsServiceInterface> documents_service) {
+  documents_service_->CancelAll();
+  documents_service_.reset(documents_service.release());
+  documents_service_->Initialize(profile_);
+}
+
 void GDataFileSystem::Shutdown() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 
   // Cancel all the in-flight operations.
   // This asynchronously cancels the URL fetch operations.
   documents_service_->CancelAll();
 }
 
 void GDataFileSystem::Authenticate(const AuthStatusCallback& callback) {
   // TokenFetcher, used in DocumentsService, must be run on UI thread.
@@ skipping 586 matching lines @@
 
 GDataFileSystemFactory::~GDataFileSystemFactory() {
 }
 
 ProfileKeyedService* GDataFileSystemFactory::BuildServiceInstanceFor(
     Profile* profile) const {
   return new GDataFileSystem(profile);
 }
 
 }  // namespace gdata