Add a message loop to TabControllerTest

chrome/browser/ui/cocoa/tabs/tab_controller_unittest.mm

 // Copyright (c) 2011 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.
 
 #import <Cocoa/Cocoa.h>
 
 #import "base/mac/scoped_nsobject.h"
+#include "base/message_loop/message_loop.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/ui/cocoa/cocoa_test_helper.h"
 #import "chrome/browser/ui/cocoa/tabs/media_indicator_button_cocoa.h"
 #import "chrome/browser/ui/cocoa/tabs/tab_controller.h"
 #import "chrome/browser/ui/cocoa/tabs/tab_controller_target.h"
 #import "chrome/browser/ui/cocoa/tabs/tab_strip_drag_controller.h"
 #import "chrome/browser/ui/cocoa/tabs/tab_view.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #import "testing/gtest_mac.h"
 #include "testing/platform_test.h"
@@ skipping 194 matching lines @@
     }
     if ([controller shouldShowCloseButton]) {
       const NSRect closeButtonFrame = [[controller closeButton] frame];
       if (NSWidth(titleFrame) > 0)
         EXPECT_LE(NSMaxX(titleFrame), NSMinX(closeButtonFrame));
       EXPECT_LE(NSMaxX(closeButtonFrame), NSMaxX(tabFrame));
       EXPECT_LE(NSMinY(tabFrame), NSMinY(closeButtonFrame));
       EXPECT_LE(NSMaxY(closeButtonFrame), NSMaxY(tabFrame));
     }
   }
+
+ private:
+  base::MessageLoop message_loop_;
 };
 
 // Tests creating the controller, sticking it in a window, and removing it.
 TEST_F(TabControllerTest, Creation) {
   NSWindow* window = test_window();
   base::scoped_nsobject<TabController> controller([[TabController alloc] init]);
   [[window contentView] addSubview:[controller view]];
   EXPECT_TRUE([controller tabView]);
   EXPECT_EQ([[controller view] window], window);
   [[controller view] display];  // Test drawing to ensure nothing leaks/crashes.
@@ skipping 300 matching lines @@
           [[controller view] setFrame:tabFrame];
           CheckForExpectedLayoutAndVisibilityOfSubviews(controller);
           --tabFrame.size.width;
         }
       }
     }
   }
 }
 
 }  // namespace