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

blimp/engine/app/blimp_content_browser_client.h

 // Copyright (c) 2015 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_BLIMP_CONTENT_BROWSER_CLIENT_H_
 #define BLIMP_ENGINE_APP_BLIMP_CONTENT_BROWSER_CLIENT_H_
 
 #include "base/macros.h"
 #include "content/public/browser/content_browser_client.h"
 
 namespace blimp {
 namespace engine {
 
 class BlimpBrowserMainParts;
 class BlimpBrowserContext;
 
 class BlimpContentBrowserClient : public content::ContentBrowserClient {
  public:
   BlimpContentBrowserClient();
   ~BlimpContentBrowserClient() override;
 
+  BlimpBrowserMainParts* blimp_browser_main_parts() {
+    return blimp_browser_main_parts_;
+  }
+
   // content::ContentBrowserClient implementation.
   content::BrowserMainParts* CreateBrowserMainParts(
       const content::MainFunctionParams& parameters) override;
   void OverrideWebkitPrefs(content::RenderViewHost* render_view_host,
                            content::WebPreferences* prefs) override;
   void RegisterRenderProcessMojoServices(
       content::ServiceRegistry* registry) override;
 
   BlimpBrowserContext* GetBrowserContext();
 
  private:
   // Owned by BrowserMainLoop
   BlimpBrowserMainParts* blimp_browser_main_parts_ = nullptr;
 
   DISALLOW_COPY_AND_ASSIGN(BlimpContentBrowserClient);
 };
 
 }  // namespace engine
 }  // namespace blimp
 
 #endif  // BLIMP_ENGINE_APP_BLIMP_CONTENT_BROWSER_CLIENT_H_