Show a replacement plug-in for loading errors.

webkit/plugins/ppapi/ppapi_webplugin_impl.cc

Index: webkit/plugins/ppapi/ppapi_webplugin_impl.cc
diff --git a/webkit/plugins/ppapi/ppapi_webplugin_impl.cc b/webkit/plugins/ppapi/ppapi_webplugin_impl.cc
index fb0166217f54a830cb8e15b846286d0fc8b7e641..c5f9fe5913f0eecfb030b533c5381ba5cce328b4 100644
--- a/webkit/plugins/ppapi/ppapi_webplugin_impl.cc
+++ b/webkit/plugins/ppapi/ppapi_webplugin_impl.cc
@@ -27,6 +27,7 @@
 
 using ppapi::NPObjectVar;
 using WebKit::WebCanvas;
+using WebKit::WebPlugin;
 using WebKit::WebPluginContainer;
 using WebKit::WebPluginParams;
 using WebKit::WebPoint;
@@ -84,7 +85,15 @@ bool WebPluginImpl::initialize(WebPluginContainer* container) {
   if (!success) {
     instance_->Delete();
     instance_ = NULL;
-    return false;
+
+    WebKit::WebPlugin* replacement_plugin =
+        init_data_->delegate->CreatePluginReplacement(
+            init_data_->module->path());
+    if (!replacement_plugin || !replacement_plugin->initialize(container))
+      return false;
+
+    container->setPlugin(replacement_plugin);
+    return true;
   }
 
   init_data_.reset();