Refactor media out of WebContentsImpl to MediaWebContentsObserver.

content/test/web_contents_observer_sanity_checker.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 CONTENT_TEST_WEB_CONTENTS_OBSERVER_SANITY_CHECKER_H_
 #define CONTENT_TEST_WEB_CONTENTS_OBSERVER_SANITY_CHECKER_H_
 
 #include <set>
 #include <string>
 
@@ skipping 63 matching lines @@
                    bool was_ignored_by_handler) override;
   void DidGetRedirectForResourceRequest(
       RenderFrameHost* render_frame_host,
       const ResourceRedirectDetails& details) override;
   void DidOpenRequestedURL(WebContents* new_contents,
                            RenderFrameHost* source_render_frame_host,
                            const GURL& url,
                            const Referrer& referrer,
                            WindowOpenDisposition disposition,
                            ui::PageTransition transition) override;
+  void MediaStartedPlaying(const MediaPlayerId& id) override;
+  void MediaStoppedPlaying(const MediaPlayerId& id) override;
   bool OnMessageReceived(const IPC::Message& message,
                          RenderFrameHost* render_frame_host) override;
   void WebContentsDestroyed() override;
 
  private:
   explicit WebContentsObserverSanityChecker(WebContents* web_contents);
   ~WebContentsObserverSanityChecker() override;
 
   std::string Format(RenderFrameHost* render_frame_host);
   void AssertRenderFrameExists(RenderFrameHost* render_frame_host);
   void AssertMainFrameExists();
 
   bool NavigationIsOngoing(NavigationHandle* navigation_handle);
 
   std::set<std::pair<int, int>> current_hosts_;
   std::set<std::pair<int, int>> live_routes_;
   std::set<std::pair<int, int>> deleted_routes_;
 
   std::set<NavigationHandle*> ongoing_navigations_;
+  std::vector<MediaPlayerId> active_media_players_;
 
   bool web_contents_destroyed_;
 
   DISALLOW_COPY_AND_ASSIGN(WebContentsObserverSanityChecker);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_TEST_WEB_CONTENTS_OBSERVER_SANITY_CHECKER_H_