[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;
 
-  void InstallAndEnableMRExtension();
-  void UninstallMRExtension();
+  virtual void InstallAndEnableMRExtension();
+  virtual 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.
   // TODO(leilei): Replace this method with WaitableEvent class.
   bool ConditionalWait(base::TimeDelta timeout,
                        base::TimeDelta interval,
                        const base::Callback<bool(void)>& callback);
 
   // Wait for a specific time.
   void Wait(base::TimeDelta timeout);
 
-  bool is_unpacked() const { return !extension_unpacked_.empty(); }
-
   bool is_extension_host_created() const { return extension_host_created_; }
 
   bool is_incognito() { return profile()->IsOffTheRecord(); }
 
-  // These values are initialized via flags.
-  base::FilePath extension_crx_;
+  // Returns the superclass' browser(). Marked virtual so that it can be
+  // overridden by MediaRouterIntegrationIncognitoBrowserTest.
+  virtual Browser* browser();
+
+  // |extension_unpacked_| is initialized via a flag.
   base::FilePath extension_unpacked_;
 
   base::WaitableEvent extension_load_event_;
   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_