Allow pages on the OSX app launcher to be turned while dragging.

ui/app_list/cocoa/app_list_view_controller_unittest.mm

 // Copyright 2013 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 "base/memory/scoped_nsobject.h"
 #import "testing/gtest_mac.h"
 #import "ui/app_list/cocoa/app_list_view_controller.h"
 #import "ui/app_list/cocoa/apps_grid_controller.h"
 #import "ui/app_list/cocoa/test/apps_grid_controller_test_helper.h"
 #include "ui/app_list/test/app_list_test_model.h"
@@ skipping 40 matching lines @@
   EXPECT_EQ(2, [pager segmentCount]);
   model()->PopulateApps(1);
   EXPECT_EQ(3, [pager segmentCount]);
 
   ReplaceTestModel(1);
   EXPECT_EQ(1, [pager segmentCount]);
 }
 
 // Test that clicking the pager changes pages.
 TEST_F(AppListViewControllerTest, PagerChangingPage) {
-  [AppsGridController setScrollAnimationDuration:0.0];
   NSSegmentedControl* pager = [app_list_view_controller_ pagerControl];
   ReplaceTestModel(kItemsPerPage * 3);
   EXPECT_EQ(3, [pager segmentCount]);
 
   EXPECT_EQ(0, [pager selectedSegment]);
   EXPECT_EQ(0u, [apps_grid_controller_ visiblePage]);
   EXPECT_EQ(1.0, [apps_grid_controller_ visiblePortionOfPage:0]);
   EXPECT_EQ(0.0, [apps_grid_controller_ visiblePortionOfPage:1]);
 
   // Emulate a click on the second segment to navigate to the second page.
   [pager setSelectedSegment:1];
   [[pager target] performSelector:[pager action]
                        withObject:pager];
 
   EXPECT_EQ(1u, [apps_grid_controller_ visiblePage]);
   EXPECT_EQ(1, [pager selectedSegment]);
   EXPECT_EQ(0.0, [apps_grid_controller_ visiblePortionOfPage:0]);
   EXPECT_EQ(1.0, [apps_grid_controller_ visiblePortionOfPage:1]);
 
   // Replace with a single page model, and ensure we go back to the first page.
   ReplaceTestModel(1);
   EXPECT_EQ(0u, [apps_grid_controller_ visiblePage]);
   EXPECT_EQ(0, [pager selectedSegment]);
   EXPECT_EQ(1, [pager segmentCount]);
   EXPECT_EQ(1.0, [apps_grid_controller_ visiblePortionOfPage:0]);
 }
 
 }  // namespace test
 }  // namespace app_list