html_viewer: Make sure window.internals is set-up correctly in layout-tests.

components/html_viewer/web_test_delegate_impl.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 COMPONENTS_HTML_VIEWER_WEB_TEST_DELEGATE_IMPL_H_
 #define COMPONENTS_HTML_VIEWER_WEB_TEST_DELEGATE_IMPL_H_
 
 #include "base/macros.h"
 #include "components/test_runner/test_preferences.h"
 #include "components/test_runner/web_test_delegate.h"
@@ skipping 94 matching lines @@
   cc::SharedBitmapManager* GetSharedBitmapManager() override;
   void DispatchBeforeInstallPromptEvent(
       int request_id,
       const std::vector<std::string>& event_platforms,
       const base::Callback<void(bool)>& callback) override;
   void ResolveBeforeInstallPromptPromise(int request_id,
                                          const std::string& platform) override;
   blink::WebPlugin* CreatePluginPlaceholder(
       blink::WebLocalFrame* frame,
       const blink::WebPluginParams& params) override;
+  void OnWebTestProxyBaseDestroy(test_runner::WebTestProxyBase* base) override;
 
   test_runner::TestPreferences prefs_;
   test_runner::WebTestInterfaces* test_interfaces_;
   test_runner::WebTestProxyBase* proxy_;
+  std::string dump_tree_;
 
   DISALLOW_COPY_AND_ASSIGN(WebTestDelegateImpl);
 };
 
 }  // namespace html_viewer
 
 #endif  // COMPONENTS_HTML_VIEWER_WEB_TEST_DELEGATE_IMPL_H_