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 d3dfc1fe4493f09bff42d1f8dcd7b8653760042b..ca7e02c4cafe6c1b0cc7bf4bf9ffd7f4198eaea3 100644
--- a/content/renderer/render_view_impl.cc
+++ b/content/renderer/render_view_impl.cc
@@ -1945,12 +1945,21 @@ WebMediaPlayer* RenderViewImpl::createMediaPlayer(
   collection->AddVideoRenderer(renderer);
   video_renderer = renderer;
 
-  scoped_ptr<webkit_glue::WebMediaPlayerImpl> result(
-      new webkit_glue::WebMediaPlayerImpl(client,
-                                          collection.release(),
-                                          message_loop_factory.release(),
-                                          media_stream_impl_.get(),
-                                          new RenderMediaLog()));
+  scoped_ptr<webkit_glue::WebMediaPlayerImpl> result;
+  if (content::GetContentClient()->renderer()
+          ->ShouldOverrideCreateWebMediaPlayer(this)) {
+    webkit_glue::WebMediaPlayerImpl* result_ptr;
+    content::GetContentClient()->renderer()->OverrideCreateWebMediaPlayer(
+        this, client, 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_glue::WebMediaPlayerImpl(client,
+                     collection.release(), message_loop_factory.release(),
+                     media_stream_impl_.get(), new RenderMediaLog()));
+  }
+
   if (!result->Initialize(frame,
                           cmd_line->HasSwitch(switches::kSimpleDataSource),
                           video_renderer)) {