App list uses PaginationModel to transition between pages.

ui/app_list/views/app_list_view_unittest.cc

 // Copyright 2014 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/app_list_view.h"
 
 #include "base/command_line.h"
 #include "base/run_loop.h"
 #include "base/strings/string_util.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 274 matching lines @@
 
     ContentsView* contents_view = main_view->contents_view();
     contents_view->SetActivePage(contents_view->GetPageIndexForNamedPage(
         ContentsView::NAMED_PAGE_START));
     contents_view->Layout();
     EXPECT_FALSE(main_view->search_box_view()->visible());
     EXPECT_TRUE(IsViewAtOrigin(start_page_view));
     EXPECT_FALSE(IsViewAtOrigin(contents_view->apps_container_view()));
     EXPECT_EQ(3u, GetVisibleTileItemViews(start_page_view->tile_views()));
 
+    contents_view->FinishCurrentAnimationForTests();

[calamity, 2014/06/12 03:26:54]

If Layout() sets everything to "where it ends up", shouldn't all animations be
cancelled on Layout()?

[Matt Giuca, 2014/06/16 07:20:28]

Good point. They previously weren't. Now Layout does end all animations, so we
don't need FinishCurrentAnimationForTests.

Note that I had to rewrite Layout to use completely different code to
UpdatePageBounds, since we need to move ALL the pages out of the way, not just
the current begin and end page (because there could be a three-way animation, it
isn't enough to just move the begin and end pages).

     contents_view->SetActivePage(
         contents_view->GetPageIndexForNamedPage(ContentsView::NAMED_PAGE_APPS));
     contents_view->Layout();
     EXPECT_TRUE(main_view->search_box_view()->visible());
     EXPECT_FALSE(IsViewAtOrigin(start_page_view));
     EXPECT_TRUE(IsViewAtOrigin(contents_view->apps_container_view()));
 
     // Check tiles hide and show on deletion and addition.
     model->CreateAndAddItem("Test app");
     EXPECT_EQ(4u, GetVisibleTileItemViews(start_page_view->tile_views()));
@@ skipping 175 matching lines @@
 INSTANTIATE_TEST_CASE_P(AppListViewTestAuraInstance,
                         AppListViewTestAura,
                         ::testing::Range<int>(TEST_TYPE_START, TEST_TYPE_END));
 
 INSTANTIATE_TEST_CASE_P(AppListViewTestDesktopInstance,
                         AppListViewTestDesktop,
                         ::testing::Range<int>(TEST_TYPE_START, TEST_TYPE_END));
 
 }  // namespace test
 }  // namespace app_list