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

blimp/engine/testing/app/test_blimp_content_main_delegate.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_TEST_BLIMP_CONTENT_MAIN_DELEGATE_H_
+#define BLIMP_ENGINE_TESTING_APP_TEST_BLIMP_CONTENT_MAIN_DELEGATE_H_
+
+#include "blimp/engine/app/blimp_content_main_delegate.h"
+
+namespace blimp {
+namespace engine {
+
+// Blimp testing implementation of ContentMainDelegate. Class to extend
+// class BlimpContentMainDelegate for testing. I.e. This overrides method
+// CreateContentBrowserClient(), replacing the use of BlimpContentBrowserClient
+// by enabling TestBlimpContentBrowserClient.
+class TestBlimpContentMainDelegate : public BlimpContentMainDelegate {
+ public:
+  TestBlimpContentMainDelegate();
+  ~TestBlimpContentMainDelegate() = default;
+
+  // BlimpContentMainDelegate implementation.
+  content::ContentBrowserClient* CreateContentBrowserClient() override;
+};
+
+}  // namespace engine
+}  // namespace blimp
+
+#endif  // BLIMP_ENGINE_TESTING_APP_TEST_BLIMP_CONTENT_MAIN_DELEGATE_H_