Extend components/test_runner's generated WebMediaStream to have a Chrome VideoTrack and Source

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/callback.h"
 #include "base/macros.h"
 #include "components/test_runner/test_preferences.h"
@@ skipping 90 matching lines @@
   void FetchManifest(
       blink::WebView* view,
       const GURL& url,
       const base::Callback<void(const blink::WebURLResponse& response,
                                 const std::string& data)>& callback) override;
   void SetPermission(const std::string& permission_name,
                      const std::string& permission_value,
                      const GURL& origin,
                      const GURL& embedding_origin) override;
   void ResetPermissions() override;
+  bool AddMediaStreamSourceAndTrack(blink::WebMediaStream* stream) override;
   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_;
   base::Closure completion_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(WebTestDelegateImpl);
 };
 
 }  // namespace html_viewer
 
 #endif  // COMPONENTS_HTML_VIEWER_WEB_TEST_DELEGATE_IMPL_H_