Defer loading of audio/video tags while prerendering.

content/renderer/render_view_impl.cc

Index: content/renderer/render_view_impl.cc
diff --git a/content/renderer/render_view_impl.cc b/content/renderer/render_view_impl.cc
index a8513016977f421f951dea955a68a2a47402d2bb..3ba374e81bbd2a6a3102e1b8e0ab93b36b011fbe 100644
--- a/content/renderer/render_view_impl.cc
+++ b/content/renderer/render_view_impl.cc
@@ -1933,13 +1933,23 @@ WebMediaPlayer* RenderViewImpl::createMediaPlayer(
     collection->AddAudioRenderer(new AudioRendererImpl());
   }
 
-  scoped_ptr<webkit_media::WebMediaPlayerImpl> result(
-      new webkit_media::WebMediaPlayerImpl(client,
-                                          AsWeakPtr(),
-                                          collection.release(),
-                                          message_loop_factory.release(),
-                                          media_stream_impl_.get(),
-                                          new RenderMediaLog()));
+  scoped_ptr<webkit_media::WebMediaPlayerImpl> result;
+  if (content::GetContentClient()->renderer()
+          ->ShouldOverrideCreateWebMediaPlayer(this)) {
+    webkit_media::WebMediaPlayerImpl* result_ptr;
+    content::GetContentClient()->renderer()->OverrideCreateWebMediaPlayer(
+        this, client, AsWeakPtr(), collection.release(),
+        message_loop_factory.release(), media_stream_impl_.get(),
+        new RenderMediaLog(), &result_ptr);
+    DCHECK(result_ptr);
+    result.reset(result_ptr);
+  } else {
+    result.reset(new webkit_media::WebMediaPlayerImpl(client, AsWeakPtr(),
+                     collection.release(), message_loop_factory.release(),
+                     media_stream_impl_.get(), new RenderMediaLog()));
+  }
+  DCHECK(result.get());
+
   if (!result->Initialize(frame,
                           cmd_line->HasSwitch(switches::kSimpleDataSource))) {
     return NULL;