Defer media playback in background tabs.

content/public/renderer/content_renderer_client.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_PUBLIC_RENDERER_CONTENT_RENDERER_CLIENT_H_
 #define CONTENT_PUBLIC_RENDERER_CONTENT_RENDERER_CLIENT_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 133 matching lines @@
   virtual void GetNavigationErrorStrings(
       content::RenderView* render_view,
       blink::WebFrame* frame,
       const blink::WebURLRequest& failed_request,
       const blink::WebURLError& error,
       std::string* error_html,
       base::string16* error_description) {}
 
   // Allows the embedder to control when media resources are loaded. Embedders
   // can run |closure| immediately if they don't wish to defer media resource
-  // loading.
+  // loading.  If |has_played_media_before| is true, the render frame has
+  // previously started media playback (i.e. played audio and video).
   virtual void DeferMediaLoad(RenderFrame* render_frame,
+                              bool has_played_media_before,
                               const base::Closure& closure);
 
   // Allows the embedder to override creating a WebMediaStreamCenter. If it
   // returns NULL the content layer will create the stream center.
   virtual blink::WebMediaStreamCenter* OverrideCreateWebMediaStreamCenter(
       blink::WebMediaStreamCenterClient* client);
 
   // Allows the embedder to override creating a WebRTCPeerConnectionHandler. If
   // it returns NULL the content layer will create the connection handler.
   virtual blink::WebRTCPeerConnectionHandler*
@@ skipping 135 matching lines @@
   // Notifies that a service worker context has been created. This function
   // is called from the worker thread.
   virtual void DidInitializeServiceWorkerContextOnWorkerThread(
       v8::Local<v8::Context> context,
       const GURL& url) {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_RENDERER_CONTENT_RENDERER_CLIENT_H_