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

content/shell/renderer/layout_test/blink_test_runner.h

 // Copyright (c) 2012 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 CONTENT_SHELL_RENDERER_LAYOUT_TEST_BLINK_TEST_RUNNER_H_
 #define CONTENT_SHELL_RENDERER_LAYOUT_TEST_BLINK_TEST_RUNNER_H_
 
 #include <deque>
 #include <vector>
 
@@ skipping 114 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& name,
                      const std::string& 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,
@@ skipping 47 matching lines @@
 
   scoped_ptr<LeakDetector> leak_detector_;
   bool needs_leak_detector_;
 
   DISALLOW_COPY_AND_ASSIGN(BlinkTestRunner);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_SHELL_RENDERER_LAYOUT_TEST_BLINK_TEST_RUNNER_H_