Experimental app list slide animation is now horizontal, not vertical.

ui/app_list/views/contents_view.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 "ui/app_list/views/contents_view.h"
 
 #include <algorithm>
 
 #include "base/logging.h"
 #include "ui/app_list/app_list_constants.h"
@@ skipping 137 matching lines @@
         break;
       case SHOW_START_PAGE:
         incoming_view_index = kIndexStartPage;
         break;
       default:
         NOTREACHED();
     }
 
     gfx::Rect incoming_target(rect);
     gfx::Rect outgoing_target(rect);
-    outgoing_target.set_y(-outgoing_target.height());
+    outgoing_target.set_x(-outgoing_target.width());
 
     for (int i = 0; i < view_model_->view_size(); ++i) {
       view_model_->set_ideal_bounds(i,
                                     i == incoming_view_index ? incoming_target
                                                              : outgoing_target);
     }
     return;
   }
 
   gfx::Rect container_frame(rect);
@@ skipping 143 matching lines @@
     if (!pagination_model_->has_transition()) {
       pagination_model_->SelectPageRelative(offset > 0 ? -1 : 1,
                                             true);
     }
     event->SetHandled();
     event->StopPropagation();
   }
 }
 
 }  // namespace app_list