[Media Router] Add integration browser tests

chrome/test/media_router/media_router_base_browsertest.h

 // Copyright 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 CHROME_TEST_MEDIA_ROUTER_MEDIA_ROUTER_BASE_BROWSERTEST_H_
 #define CHROME_TEST_MEDIA_ROUTER_MEDIA_ROUTER_BASE_BROWSERTEST_H_
 
 #include <string>
 
 #include "base/callback.h"
@@ skipping 25 matching lines @@
 
   // InProcessBrowserTest Overrides
   void SetUp() override;
   void TearDown() override;
 
  protected:
   // InProcessBrowserTest Overrides
   void SetUpOnMainThread() override;
   void TearDownOnMainThread() override;
 
+  // Installs the Media Router extension for the incognito profile and returns
+  // an incognito browser.
+  Browser* GetIncognitoBrowserWithMRExtension();

[mark a. foltz, 2017/01/20 19:00:09]

It seems inconsistent for this to return a Browser* while
InstallAndEnableMRExtension() below for normal profiles does not.

[takumif, 2017/02/07 22:17:35]

Making a subclass for incognito.

+
   void InstallAndEnableMRExtension();
   void UninstallMRExtension();
 
   virtual void ParseCommandLine();
 
   // extensions::ProcessManagerObserver Overrides
   void OnBackgroundHostCreated(extensions::ExtensionHost* host) override;
 
   // Wait until get the successful callback or timeout.
   // Returns true if the condition is satisfied before the timeout.
@@ skipping 19 matching lines @@
   std::string extension_id_;
   bool extension_host_created_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(MediaRouterBaseBrowserTest);
 };
 
 }  // namespace media_router
 
 #endif  // CHROME_TEST_MEDIA_ROUTER_MEDIA_ROUTER_BASE_BROWSERTEST_H_