Updates the display message in the uber tray.

ash/drag_drop/drag_drop_tracker_unittest.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 "ash/drag_drop/drag_drop_tracker.h"
 
+#include "ash/root_window_controller.h"
 #include "ash/shell.h"
 #include "ash/shell_window_ids.h"
+#include "ash/system/tray/system_tray.h"
 #include "ash/test/ash_test_base.h"
 #include "base/memory/scoped_ptr.h"
 #include "ui/aura/root_window.h"
 #include "ui/aura/test/test_windows.h"
 #include "ui/aura/window.h"
 
 namespace ash {
 namespace test {
 
 class DragDropTrackerTest : public test::AshTestBase {
  public:
   virtual void SetUp() OVERRIDE {
     AshTestBase::SetUp();
     UpdateDisplay("200x200,200x200");
+    // close all notification for display change. Otherwise some event may
+    // happen on the notification bubble, which breaks the test expectation.
+    // TODO(mukai): remove this when the display change notification has moved
+    // to the message_center.
+    Shell::RootWindowControllerList root_controllers =
+        Shell::GetAllRootWindowControllers();
+    for (size_t i = 0; i < root_controllers.size(); ++i)
+      root_controllers[i]->GetSystemTray()->CloseNotificationBubbleForTest();
   }
 
   aura::Window* CreateTestWindow(const gfx::Rect& bounds) {
     static int window_id = 0;
     return CreateTestWindowInShellWithDelegate(
         aura::test::TestWindowDelegate::CreateSelfDestroyingDelegate(),
         window_id++,
         bounds);
   }
 
@@ skipping 160 matching lines @@
   scoped_ptr<ui::LocatedEvent> converted11(ConvertEvent(window1.get(),
                                                            original11));
   EXPECT_EQ(original11.type(), converted11->type());
   EXPECT_EQ("50,50", converted11->location().ToString());
   EXPECT_EQ("150,150", converted11->root_location().ToString());
   EXPECT_EQ(original11.flags(), converted11->flags());
 }
 
 }  // namespace test
 }  // namespace aura