Animate the OverviewButtonTray

ash/system/overview/overview_button_tray_unittest.cc

Index: ash/system/overview/overview_button_tray_unittest.cc
diff --git a/ash/system/overview/overview_button_tray_unittest.cc b/ash/system/overview/overview_button_tray_unittest.cc
index bc3fd695031be4bc6dbe61263f6e00725c0ed365..fcf241e97d92fbc59018ae08adbd5bcc60c0d81e 100644
--- a/ash/system/overview/overview_button_tray_unittest.cc
+++ b/ash/system/overview/overview_button_tray_unittest.cc
@@ -10,6 +10,7 @@
 #include "ash/shelf/shelf_widget.h"
 #include "ash/shell.h"
 #include "ash/system/status_area_widget.h"
+#include "ash/system/tray/tray_background_view.h"
 #include "ash/system/user/login_status.h"
 #include "ash/test/ash_test_base.h"
 #include "ash/test/status_area_widget_test_helper.h"
@@ -41,6 +42,11 @@ class OverviewButtonTrayTest : public test::AshTestBase {
   OverviewButtonTrayTest() {}
   virtual ~OverviewButtonTrayTest() {}
 
+  virtual void SetUp() OVERRIDE {
+    TrayBackgroundView::DisableAnimationsForTest();
+    test::AshTestBase::SetUp();
+  }
+
  protected:
   views::ImageView* GetImageView(OverviewButtonTray* tray) {
     return tray->icon_;