[Blimp] Refactor Blimp test engine with embedded test server and URL rewriting

blimp/engine/testing/app/blimp_content_main_delegate_for_test.h

+// Copyright 2016 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 BLIMP_ENGINE_TESTING_APP_BLIMP_CONTENT_MAIN_DELEGATE_FOR_TEST_H_
+#define BLIMP_ENGINE_TESTING_APP_BLIMP_CONTENT_MAIN_DELEGATE_FOR_TEST_H_
+
+#include <memory>
+
+#include "blimp/engine/app/blimp_content_main_delegate.h"
+
+namespace blimp {
+namespace engine {
+
+class BlimpContentMainDelegateForTest : public BlimpContentMainDelegate {
+ public:
+  BlimpContentMainDelegateForTest();
+  ~BlimpContentMainDelegateForTest() = default;
+
+  // Override content::ContentMainDelegate implementation
+  // in class BlimpContentMainDelegate.
+  content::ContentBrowserClient* CreateContentBrowserClient() override;
+};
+
+}  // namespace engine
+}  // namespace blimp
+
+#endif  // BLIMP_ENGINE_TESTING_APP_BLIMP_CONTENT_MAIN_DELEGATE_FOR_TEST_H_