Defer loading of audio/video tags while prerendering.

chrome/renderer/chrome_content_renderer_client.cc

Index: chrome/renderer/chrome_content_renderer_client.cc
diff --git a/chrome/renderer/chrome_content_renderer_client.cc b/chrome/renderer/chrome_content_renderer_client.cc
index 86623cc9cfc8465227b45b83279777fc4b43ecb6..fc2400d7e9db8e958218af41cecbbc75c507654a 100644
--- a/chrome/renderer/chrome_content_renderer_client.cc
+++ b/chrome/renderer/chrome_content_renderer_client.cc
@@ -49,6 +49,7 @@
 #include "chrome/renderer/plugins/missing_plugin.h"
 #include "chrome/renderer/plugins/plugin_uma.h"
 #include "chrome/renderer/prerender/prerender_helper.h"
+#include "chrome/renderer/prerender/prerender_webmediaplayer.h"
 #include "chrome/renderer/print_web_view_helper.h"
 #include "chrome/renderer/renderer_histogram_snapshots.h"
 #include "chrome/renderer/safe_browsing/malware_dom_details.h"
@@ -272,6 +273,26 @@ bool ChromeContentRendererClient::OverrideCreatePlugin(
   return true;
 }
 
+bool ChromeContentRendererClient::ShouldOverrideCreateWebMediaPlayer(
+    content::RenderView* view) {
+  return prerender::PrerenderHelper::IsPrerendering(view);
+}
+
+void ChromeContentRendererClient::OverrideCreateWebMediaPlayer(
+    content::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) {
+  DCHECK(ShouldOverrideCreateWebMediaPlayer(render_view));
+  *player = new prerender::PrerenderWebMediaPlayer(render_view, client,
+      delegate, collection, message_loop_factory, media_stream_client,
+      media_log);
+}
+
 WebPlugin* ChromeContentRendererClient::CreatePlugin(
     content::RenderView* render_view,
     WebFrame* frame,