Emit error events if the loading of an object element failed

components/plugins/renderer/plugin_placeholder.h

 // Copyright 2013 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.
 
 #ifndef COMPONENTS_PLUGINS_RENDERER_PLUGIN_PLACEHOLDER_H_
 #define COMPONENTS_PLUGINS_RENDERER_PLUGIN_PLACEHOLDER_H_
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "components/plugins/renderer/webview_plugin.h"
@@ skipping 22 matching lines @@
 
  protected:
   blink::WebLocalFrame* GetFrame();
   const blink::WebPluginParams& GetPluginParams() const;
 
   // WebViewPlugin::Delegate methods:
   void ShowContextMenu(const blink::WebMouseEvent&) override;
   void PluginDestroyed() override;
   v8::Local<v8::Object> GetV8ScriptableObject(
       v8::Isolate* isolate) const override;
+  bool IsErrorPlaceholder() override;
 
  protected:
   // Hide this placeholder.
   void HidePlugin();
   bool hidden() { return hidden_; }
 
   // JavaScript callbacks:
   void HideCallback();
 
  private:
@@ skipping 26 matching lines @@
   v8::Local<v8::Value> GetV8Handle(v8::Isolate* isolate) final;
 
   // gin::Wrappable method:
   gin::ObjectTemplateBuilder GetObjectTemplateBuilder(
       v8::Isolate* isolate) override;
 };
 
 }  // namespace plugins
 
 #endif  // COMPONENTS_PLUGINS_RENDERER_PLUGIN_PLACEHOLDER_H_