[Extensions] DCHECK that ExtensionFunctions respond (and only once)

chrome/browser/extensions/api/extension_action/browser_action_interactive_test.cc

 // Copyright 2013 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 "build/build_config.h"
 #include "chrome/browser/extensions/browser_action_test_util.h"
 #include "chrome/browser/extensions/extension_action.h"
 #include "chrome/browser/extensions/extension_action_manager.h"
 #include "chrome/browser/extensions/extension_apitest.h"
 #include "chrome/browser/extensions/extension_service.h"
@@ skipping 99 matching lines @@
   EXPECT_TRUE(new_browser != NULL);
 
 // Flaky on non-aura linux http://crbug.com/309749
 #if !(defined(OS_LINUX) && !defined(USE_AURA))
   ResultCatcher catcher;
   {
     content::WindowedNotificationObserver frame_observer(
         content::NOTIFICATION_LOAD_COMPLETED_MAIN_FRAME,
         content::NotificationService::AllSources());
     // Show second popup in new window.
-    listener.Reply("");
+    listener.Reply("show another");
     frame_observer.Wait();
     EXPECT_TRUE(BrowserActionTestUtil(new_browser).HasPopup());
   }
   ASSERT_TRUE(catcher.GetNextResult()) << message_;
 #endif
 }
 
 // Tests opening a popup in an incognito window.
 IN_PROC_BROWSER_TEST_F(BrowserActionInteractiveTest, TestOpenPopupIncognito) {
   if (!ShouldRunPopupTest())
@@ skipping 76 matching lines @@
   content::WindowedNotificationObserver frame_observer(
       content::NOTIFICATION_LOAD_COMPLETED_MAIN_FRAME,
       content::NotificationService::AllSources());
   // Open popup in the first extension.
   BrowserActionTestUtil(browser()).Press(0);
   frame_observer.Wait();
   EXPECT_TRUE(BrowserActionTestUtil(browser()).HasPopup());
 
   ResultCatcher catcher;
   // Return control to javascript to validate that opening a popup fails now.
-  listener.Reply("");
+  listener.Reply("show another");
   ASSERT_TRUE(catcher.GetNextResult()) << message_;
 }
 
 // Test that openPopup does not grant tab permissions like for browser action
 // clicks if the activeTab permission is set.
 IN_PROC_BROWSER_TEST_F(BrowserActionInteractiveTest,
                        TestOpenPopupDoesNotGrantTabPermissions) {
   if (!ShouldRunPopupTest())
     return;
 
@@ skipping 148 matching lines @@
 
   // Forcibly closing the browser HWND should not cause a crash.
   EXPECT_EQ(TRUE, ::CloseWindow(hwnd));
   EXPECT_EQ(TRUE, ::DestroyWindow(hwnd));
   EXPECT_EQ(FALSE, ::IsWindow(hwnd));
 }
 #endif  // OS_WIN
 
 }  // namespace
 }  // namespace extensions