Emit error events if the loading of an object element failed

components/plugins/renderer/loadable_plugin_placeholder.h

Index: components/plugins/renderer/loadable_plugin_placeholder.h
diff --git a/components/plugins/renderer/loadable_plugin_placeholder.h b/components/plugins/renderer/loadable_plugin_placeholder.h
index ea52ae9e5d68ab9b1e4418d250b90edc6828163d..2c74086136fc7b9507814d874b519e8b261c781f 100644
--- a/components/plugins/renderer/loadable_plugin_placeholder.h
+++ b/components/plugins/renderer/loadable_plugin_placeholder.h
@@ -91,6 +91,7 @@ class LoadablePluginPlaceholder : public PluginPlaceholderBase {
   v8::Local<v8::Object> GetV8ScriptableObject(
       v8::Isolate* isolate) const override;
   void OnUnobscuredRectUpdate(const gfx::Rect& unobscured_rect) override;
+  bool IsErrorPlaceholder() override;
 
   // RenderFrameObserver methods:
   void WasShown() override;