Automated test for dragging between same-page, cross-site frames.

content/public/test/browser_test_utils.cc

Index: content/public/test/browser_test_utils.cc
diff --git a/content/public/test/browser_test_utils.cc b/content/public/test/browser_test_utils.cc
index 7d066fe1efd414f6abb311af94bc09f107b83b1d..0bac669d6bf7b2e633b3bd4218742a69fcbc256e 100644
--- a/content/public/test/browser_test_utils.cc
+++ b/content/public/test/browser_test_utils.cc
@@ -1327,7 +1327,11 @@ bool DOMMessageQueue::WaitForMessage(std::string* message) {
         new MessageLoopRunner(MessageLoopRunner::QuitMode::IMMEDIATE);
     message_loop_runner_->Run();
   }
-  // The queue should not be empty, unless we were quit because of a timeout.
+  return PopMessage(message);
+}
+
+bool DOMMessageQueue::PopMessage(std::string* message) {
+  DCHECK(message);
   if (message_queue_.empty())
     return false;
   *message = message_queue_.front();