Tests for dragging between two frames (potentially cross-site from main frame).

content/public/test/browser_test_utils.cc

 // Copyright (c) 2012 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 "content/public/test/browser_test_utils.h"
 
 #include <stddef.h>
 #include <tuple>
 #include <utility>
 
@@ skipping 1285 matching lines @@
   if (message_loop_runner_.get())
     message_loop_runner_->Quit();
 }
 
 void DOMMessageQueue::RenderProcessGone(base::TerminationStatus status) {
   switch (status) {
     case base::TERMINATION_STATUS_NORMAL_TERMINATION:
     case base::TERMINATION_STATUS_STILL_RUNNING:
       break;
     default:
-      message_loop_runner_->Quit();
+      if (message_loop_runner_.get())
+        message_loop_runner_->Quit();
       break;
   }
 }
 
 void DOMMessageQueue::ClearQueue() {
   message_queue_ = std::queue<std::string>();
 }
 
 bool DOMMessageQueue::WaitForMessage(std::string* message) {
   DCHECK(message);
@@ skipping 450 matching lines @@
 
   std::string ascii_message = base::UTF16ToASCII(message);
   if (base::MatchPattern(ascii_message, filter_)) {
     message_ = ascii_message;
     message_loop_runner_->Quit();
   }
   return false;
 }
 
 }  // namespace content