sync: Add GetAllSyncData to sync/api

chrome/browser/themes/theme_syncable_service_unittest.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/themes/theme_syncable_service.h"
 
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/files/file_path.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 43 matching lines @@
 
   // syncer::SyncChangeProcessor implementation.
   virtual syncer::SyncError ProcessSyncChanges(
         const tracked_objects::Location& from_here,
         const syncer::SyncChangeList& change_list) OVERRIDE {
     change_output_->insert(change_output_->end(), change_list.begin(),
                            change_list.end());
     return syncer::SyncError();
   }
 
+  virtual syncer::SyncDataList GetAllSyncData(syncer::ModelType type) const {
+    return syncer::SyncDataList();
+  }
+
   void SetChangeOutput(syncer::SyncChangeList *change_output) {
     change_output_ = change_output;
   }
 
  private:
   syncer::SyncChangeList *change_output_;
 };
 
 class FakeThemeService : public ThemeService {
  public:
@@ skipping 540 matching lines @@
 
 TEST_F(PolicyInstalledThemeTest, InstallThemeByPolicy) {
   // Set up theme service to use custom theme that was installed by policy.
   fake_theme_service_->SetTheme(theme_extension_.get());
 
   syncer::SyncDataList data_list =
       theme_sync_service_->GetAllSyncData(syncer::THEMES);
 
   ASSERT_EQ(0u, data_list.size());
 }