Emit error events if the loading of an object element failed

components/plugins/renderer/loadable_plugin_placeholder.cc

 // Copyright 2015 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 "components/plugins/renderer/loadable_plugin_placeholder.h"
 
 #include <memory>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 160 matching lines @@
 
 v8::Local<v8::Object> LoadablePluginPlaceholder::GetV8ScriptableObject(
     v8::Isolate* isolate) const {
   // Pass through JavaScript access to the underlying throttled plugin.
   if (premade_throttler_ && premade_throttler_->GetWebPlugin()) {
     return premade_throttler_->GetWebPlugin()->v8ScriptableObject(isolate);
   }
   return v8::Local<v8::Object>();
 }
 
+bool LoadablePluginPlaceholder::IsErrorPlaceholder() {
+  return !allow_loading_;
+}
+
 void LoadablePluginPlaceholder::OnUnobscuredRectUpdate(
     const gfx::Rect& unobscured_rect) {
   DCHECK(content::RenderThread::Get());
 
   if (!plugin() || !finished_loading_)
     return;
 
   if (!is_blocked_for_tinyness_ && !is_blocked_for_power_saver_poster_)
     return;
 
@@ skipping 175 matching lines @@
   return identifier_;
 }
 
 bool LoadablePluginPlaceholder::LoadingBlocked() const {
   DCHECK(allow_loading_);
   return is_blocked_for_tinyness_ || is_blocked_for_background_tab_ ||
          is_blocked_for_power_saver_poster_ || is_blocked_for_prerendering_;
 }
 
 }  // namespace plugins