Defer loading of audio/video tags while prerendering.

content/renderer/render_view_impl.cc

 // Copyright (c) 2011 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.
 
 #include "content/renderer/render_view_impl.h"
 
 #include <algorithm>
 #include <cmath>
 #include <string>
 #include <vector>
@@ skipping 1924 matching lines @@
     collection->AddAudioRenderer(new AudioRendererImpl());
   }
 
   scoped_refptr<webkit_glue::WebVideoRenderer> video_renderer;
   bool pts_logging = cmd_line->HasSwitch(switches::kEnableVideoLogging);
   scoped_refptr<webkit_glue::VideoRendererImpl> renderer(
       new webkit_glue::VideoRendererImpl(pts_logging));
   collection->AddVideoRenderer(renderer);
   video_renderer = renderer;
 
-  scoped_ptr<webkit_glue::WebMediaPlayerImpl> result(
-      new webkit_glue::WebMediaPlayerImpl(client,
-                                          AsWeakPtr(),
-                                          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, 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_glue::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),
                           video_renderer)) {
     return NULL;
   }
   return result.release();
 }
 
 WebApplicationCacheHost* RenderViewImpl::createApplicationCacheHost(
     WebFrame* frame, WebApplicationCacheHostClient* client) {
@@ skipping 2742 matching lines @@
   return webview()->settings()->useThreadedCompositor();
 }
 
 void RenderViewImpl::OnJavaBridgeInit(
     const IPC::ChannelHandle& channel_handle) {
   DCHECK(!java_bridge_dispatcher_.get());
 #if defined(ENABLE_JAVA_BRIDGE)
   java_bridge_dispatcher_.reset(new JavaBridgeDispatcher(this, channel_handle));
 #endif
 }