Deal with frame removal by content scripts

extensions/renderer/dispatcher.cc

 // Copyright 2014 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 "extensions/renderer/dispatcher.h"
 
 #include <stddef.h>
 
 #include <utility>
 
@@ skipping 482 matching lines @@
   }
 
   // In testing, the document lifetime events can happen after the render
   // process shutdown event.
   // See: http://crbug.com/21508 and http://crbug.com/500851
   if (content_watcher_) {
     content_watcher_->DidCreateDocumentElement(frame);
   }
 }
 
+void Dispatcher::RunScriptsAtDocumentStart(content::RenderFrame* render_frame) {
+  ExtensionFrameHelper* frame_helper = ExtensionFrameHelper::Get(render_frame);
+  if (!frame_helper)
+    return;  // The frame is invisible to extensions.
+
+  frame_helper->RunScriptsAtDocumentStart();
+  // |frame_helper| and |render_frame| might be dead by now.
+}
+
+void Dispatcher::RunScriptsAtDocumentEnd(content::RenderFrame* render_frame) {
+  ExtensionFrameHelper* frame_helper = ExtensionFrameHelper::Get(render_frame);
+  if (!frame_helper)
+    return;  // The frame is invisible to extensions.
+
+  frame_helper->RunScriptsAtDocumentEnd();
+  // |frame_helper| and |render_frame| might be dead by now.
+}
+
 void Dispatcher::OnExtensionResponse(int request_id,
                                      bool success,
                                      const base::ListValue& response,
                                      const std::string& error) {
   request_sender_->HandleResponse(request_id, success, response, error);
 }
 
 void Dispatcher::DispatchEvent(const std::string& extension_id,
                                const std::string& event_name) const {
   base::ListValue args;
@@ skipping 1094 matching lines @@
   // The "guestViewDeny" module must always be loaded last. It registers
   // error-providing custom elements for the GuestView types that are not
   // available, and thus all of those types must have been checked and loaded
   // (or not loaded) beforehand.
   if (context_type == Feature::BLESSED_EXTENSION_CONTEXT) {
     module_system->Require("guestViewDeny");
   }
 }
 
 }  // namespace extensions