[Chromecast] Turn CastContentWindow into an abstract interface.

chromecast/browser/test/cast_browser_test.h

 // Copyright 2014 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 CHROMECAST_BROWSER_TEST_CAST_BROWSER_TEST_H_
 #define CHROMECAST_BROWSER_TEST_CAST_BROWSER_TEST_H_
 
 #include <memory>
 
 #include "base/macros.h"
+#include "chromecast/browser/cast_content_window.h"
 #include "content/public/test/browser_test.h"
 #include "content/public/test/browser_test_base.h"
 
 namespace content {
 class WebContents;
 }
 
 namespace chromecast {
 namespace shell {
 
-class CastContentWindow;
-
 // This test allows for running an entire browser-process lifecycle per unit
 // test, using Chromecast's cast_shell. This starts up the shell, runs a test
 // case, then shuts down the entire shell.
 // Note that this process takes 7-10 seconds per test case on Chromecast, so
 // fewer test cases with more assertions are preferable.
-class CastBrowserTest : public content::BrowserTestBase {
+class CastBrowserTest : public content::BrowserTestBase,
+                        CastContentWindow::Delegate {
  protected:
   CastBrowserTest();
   ~CastBrowserTest() override;
 
   // content::BrowserTestBase implementation:
   void SetUp() final;
   void TearDownOnMainThread() override;
   void SetUpCommandLine(base::CommandLine* command_line) override;
   void RunTestOnMainThreadLoop() final;
 
   content::WebContents* NavigateToURL(const GURL& url);
 
  private:
+  // CastContentWindow::Delegate implementation:
+  void OnWindowDestroyed() override;
+  void OnKeyEvent(const ui::KeyEvent& key_event) override;
+
   std::unique_ptr<CastContentWindow> window_;
   std::unique_ptr<content::WebContents> web_contents_;
 
   DISALLOW_COPY_AND_ASSIGN(CastBrowserTest);
 };
 
 }  // namespace shell
 }  // namespace chromecast
 
 #endif  // CHROMECAST_BROWSER_TEST_CAST_BROWSER_TEST_H_