Prepare a bunch of ash tests for workspace2. With Workspace2 you can't

ash/wm/workspace_controller_test_helper.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 "ash/wm/workspace_controller_test_helper.h"
 
 #include "ash/wm/workspace_controller.h"
 #include "ash/wm/workspace/workspace_event_filter_test_helper.h"
+#include "ui/aura/window.h"
 
 namespace ash {
 namespace internal {
 
 WorkspaceControllerTestHelper::WorkspaceControllerTestHelper(
     WorkspaceController* controller)
     : controller_(controller) {
 }
 
 WorkspaceControllerTestHelper::~WorkspaceControllerTestHelper() {
 }
 
+WorkspaceEventFilter* WorkspaceControllerTestHelper::GetFilter() {
+  return controller_->event_filter_;
+}
+
 MultiWindowResizeController*
 WorkspaceControllerTestHelper::GetMultiWindowResizeController() {
-  return WorkspaceEventFilterTestHelper(filter()).resize_controller();
+  return WorkspaceEventFilterTestHelper(GetFilter()).resize_controller();
 }
 
 }  // namespace internal
 }  // namespace ash