Skip mulitple-dispay tests on win8

ash/test/ash_test_base.h

 // 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.
 
 #ifndef ASH_TEST_ASH_TEST_BASE_H_
 #define ASH_TEST_ASH_TEST_BASE_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
@@ skipping 77 matching lines @@
 
   // Attach |window| to the current shell's root window.
   void SetDefaultParentByPrimaryRootWindow(aura::Window* window);
 
   // Returns the EventGenerator that uses screen coordinates and works
   // across multiple displays. It createse a new generator if it
   // hasn't been created yet.
   aura::test::EventGenerator& GetEventGenerator();
 
  protected:
+  // True if the running environment supports multiple displays,
+  // or false otherwise (e.g. win8 bot).
+  static bool SupportsMultipleDisplays();
+
   void RunAllPendingInMessageLoop();
 
   // Utility methods to emulate user logged in or not, session started or not
   // and user able to lock screen or not cases.
   void SetSessionStarted(bool session_started);
   void SetUserLoggedIn(bool user_logged_in);
   void SetCanLockScreen(bool can_lock_screen);
 
  private:
   bool setup_called_;
   bool teardown_called_;
   base::MessageLoopForUI message_loop_;
   scoped_ptr<AshTestHelper> ash_test_helper_;
   scoped_ptr<aura::test::EventGenerator> event_generator_;
 #if defined(OS_WIN)
   // Note that the order is important here as ipc_thread_ should be destroyed
   // after metro_viewer_host_->channel_.
   scoped_ptr<base::Thread> ipc_thread_;
   scoped_ptr<TestMetroViewerProcessHost> metro_viewer_host_;
   ui::ScopedOleInitializer ole_initializer_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(AshTestBase);
 };
 
 }  // namespace test
 }  // namespace ash
 
 #endif  // ASH_TEST_ASH_TEST_BASE_H_