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

blimp/engine/testing/app/blimp_content_browser_client_for_test.cc

+// 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.
+
+#include "blimp/engine/testing/app/blimp_browser_testing_main_parts.h"
+#include "blimp/engine/testing/app/blimp_content_browser_client_for_test.h"
+
+namespace blimp {
+namespace engine {
+
+BlimpContentBrowserClientForTest::BlimpContentBrowserClientForTest() {}
+
+content::BrowserMainParts*
+BlimpContentBrowserClientForTest::CreateBrowserMainParts(
+    const content::MainFunctionParams& parameters) {
+  blimp_browser_main_parts_ = new BlimpBrowserTestingMainParts(parameters);
+  BlimpContentBrowserClient::SetBrowserMainPartsForTesting(
+      blimp_browser_main_parts_);
+  // BrowserMainLoop takes ownership of the returned BrowserMainParts.
+  return blimp_browser_main_parts_;
+}
+
+}  // namespace engine
+}  // namespace blimp