[Blimp] Adds blimp engine browser test framework and LoadUrl test.

blimp/engine/app/test_content_main_delegate.h

Index: blimp/engine/app/test_content_main_delegate.h
diff --git a/blimp/engine/app/test_content_main_delegate.h b/blimp/engine/app/test_content_main_delegate.h
new file mode 100644
index 0000000000000000000000000000000000000000..51f0c501de0774fc6c387471990f70253c16479f
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+++ b/blimp/engine/app/test_content_main_delegate.h
@@ -0,0 +1,30 @@
+// 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_APP_TEST_CONTENT_MAIN_DELEGATE_H_
+#define BLIMP_ENGINE_APP_TEST_CONTENT_MAIN_DELEGATE_H_
+
+#include <memory>
+
+#include "base/macros.h"
+#include "blimp/engine/app/blimp_content_main_delegate.h"
+
+namespace blimp {
+namespace engine {
+
+class TestContentMainDelegate : public BlimpContentMainDelegate {
+ public:
+  TestContentMainDelegate();
+  ~TestContentMainDelegate() override;
+
+  static TestContentMainDelegate* GetInstance();
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(TestContentMainDelegate);
+};
+
+}  // namespace engine
+}  // namespace blimp
+
+#endif  // BLIMP_ENGINE_APP_TEST_CONTENT_MAIN_DELEGATE_H_