Allow WebUI Tests to use preLoad in HtmlDialogUI.

chrome/test/data/webui/print_preview.h

Index: chrome/test/data/webui/print_preview.h
diff --git a/chrome/test/data/webui/print_preview.h b/chrome/test/data/webui/print_preview.h
new file mode 100644
index 0000000000000000000000000000000000000000..2bc46001d8c37c1d3040ae57af9cb9bb6d1aab3e
--- /dev/null
+++ b/chrome/test/data/webui/print_preview.h
@@ -0,0 +1,25 @@
+// Copyright (c) 2011 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 CHROME_TEST_DATA_WEBUI_PRINT_PREVIEW_H_
+#define CHROME_TEST_DATA_WEBUI_PRINT_PREVIEW_H_
+#pragma once
+
+#include "base/command_line.h"
+#include "chrome/browser/ui/webui/web_ui_browsertest.h"
+#include "chrome/common/chrome_switches.h"
+
+class PrintPreviewWebUITest : public WebUIBrowserTest {
+ public:
+  PrintPreviewWebUITest();
+  virtual ~PrintPreviewWebUITest();
+
+ private:
+  // WebUIBrowserTest implementation.
+  virtual void SetUpCommandLine(CommandLine* command_line) OVERRIDE;
+
+  DISALLOW_COPY_AND_ASSIGN(PrintPreviewWebUITest);
+};
+
+#endif  // CHROME_TEST_DATA_WEBUI_PRINT_PREVIEW_H_