Skip test that requires multiple displays on win8

ash/wm/workspace/workspace_layout_manager_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/wm/workspace/workspace_layout_manager.h"
 
 #include "ash/display/display_layout.h"
 #include "ash/display/display_manager.h"
 #include "ash/root_window_controller.h"
 #include "ash/screen_ash.h"
@@ skipping 74 matching lines @@
   // 2nd display is disconnected.
   window_state->Minimize();
   UpdateDisplay("400x300");
   window_state->Restore();
   EXPECT_EQ(Shell::GetPrimaryRootWindow(), window->GetRootWindow());
   EXPECT_TRUE(
       Shell::GetPrimaryRootWindow()->bounds().Intersects(window->bounds()));
 }
 
 TEST_F(WorkspaceLayoutManagerTest, KeepMinimumVisibilityInDisplays) {
+  if (!SupportsMultipleDisplays())
+    return;
+
   UpdateDisplay("300x400,400x500");
   Shell::RootWindowList root_windows = Shell::GetAllRootWindows();
 
   DisplayLayout layout(DisplayLayout::TOP, 0);
   Shell::GetInstance()->display_manager()->
       SetLayoutForCurrentDisplays(layout);
   EXPECT_EQ("0,-500 400x500", root_windows[1]->GetBoundsInScreen().ToString());
 
   scoped_ptr<aura::Window> window1(
       CreateTestWindowInShellWithBounds(gfx::Rect(10, -400, 200, 200)));
@@ skipping 292 matching lines @@
       window->bounds().ToString());
 
   // Directly setting the bounds triggers a slightly different code path. Verify
   // that too.
   window->SetBounds(window_bounds);
   EXPECT_EQ(gfx::Rect(gfx::Point(100, 101), work_area).ToString(),
       window->bounds().ToString());
 }
 
 }  // namespace ash