Defer loading of audio/video tags while prerendering.

content/renderer/mock_content_renderer_client.cc

Index: content/renderer/mock_content_renderer_client.cc
diff --git a/content/renderer/mock_content_renderer_client.cc b/content/renderer/mock_content_renderer_client.cc
index 67ef5c6a78171ac4ef2685a5ecd0bedb0f474825..b033e43cb0d59ee6e82c51b75befc40d21940c65 100644
--- a/content/renderer/mock_content_renderer_client.cc
+++ b/content/renderer/mock_content_renderer_client.cc
@@ -42,6 +42,22 @@ bool MockContentRendererClient::HasErrorPage(int http_status_code,
   return false;
 }
 
+bool MockContentRendererClient::ShouldOverrideCreateWebMediaPlayer(
+    RenderView* view)  {
+  return false;
+}
+
+void MockContentRendererClient::OverrideCreateWebMediaPlayer(
+    RenderView* render_view,
+    WebKit::WebMediaPlayerClient* client,
+    base::WeakPtr<webkit_media::WebMediaPlayerDelegate> delegate,
+    media::FilterCollection* collection,
+    media::MessageLoopFactory* message_loop_factory,
+    webkit_media::MediaStreamClient* media_stream_client,
+    media::MediaLog* media_log,
+    webkit_media::WebMediaPlayerImpl** player) {
+}
+
 void MockContentRendererClient::GetNavigationErrorStrings(
     const WebKit::WebURLRequest& failed_request,
     const WebKit::WebURLError& error,