Emit error events if the loading of an object element failed

third_party/WebKit/public/web/WebPlugin.h

Index: third_party/WebKit/public/web/WebPlugin.h
diff --git a/third_party/WebKit/public/web/WebPlugin.h b/third_party/WebKit/public/web/WebPlugin.h
index 270ba343b527cfcf731395108c11fed020df0c0c..ee1d0dd08c44a94bc1694516b4a852588d742d04 100644
--- a/third_party/WebKit/public/web/WebPlugin.h
+++ b/third_party/WebKit/public/web/WebPlugin.h
@@ -239,8 +239,13 @@ class WebPlugin {
   virtual bool CanRotateView() { return false; }
   // Rotates the plugin's view of its content.
   virtual void RotateView(RotationType type) {}
-
+  // Check whether a plugin can be interacted with. A positive return value
+  // means the plugin has not loaded and hence cannot be interacted with.
+  // The plugin could, however, load successfully later.
   virtual bool IsPlaceholder() { return true; }
+  // Check whether a plugin failed to load, with there being no possibility of
+  // it loading later.
+  virtual bool IsErrorPlaceholder() { return false; }
 
  protected:
   ~WebPlugin() {}