Rework app list item drag zones.

ui/app_list/views/app_list_main_view_unittest.cc

 // 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 "ui/app_list/views/app_list_main_view.h"
 
 #include "base/memory/scoped_ptr.h"
 #include "base/run_loop.h"
 #include "base/time/time.h"
 #include "base/timer/timer.h"
@@ skipping 243 matching lines @@
 TEST_F(AppListMainViewTest, DragLastItemFromFolderAndDropAtLastSlot) {
   AppListItemView* folder_item_view = CreateAndOpenSingleItemFolder();
   const gfx::Rect first_slot_tile = folder_item_view->bounds();
 
   EXPECT_EQ(1, FolderViewModel()->view_size());
 
   AppListItemView* dragged = StartDragForReparent(0);
 
   // Drop it to the slot on the right of first slot.
   gfx::Rect drop_target_tile(first_slot_tile);
-  drop_target_tile.Offset(first_slot_tile.width(), 0);
+  drop_target_tile.Offset(first_slot_tile.width() * 2, 0);
   gfx::Point point = drop_target_tile.CenterPoint();
   SimulateUpdateDrag(FolderGridView(), AppsGridView::MOUSE, dragged, point);
   SimulateUpdateDrag(FolderGridView(), AppsGridView::MOUSE, dragged, point);
   base::RunLoop().RunUntilIdle();
 
   // Drop it.
   FolderGridView()->EndDrag(false);
   base::RunLoop().RunUntilIdle();
 
   // Folder icon view should be gone and there is only one item view.
@@ skipping 29 matching lines @@
 
   // Additional mouse move operations should be ignored.
   gfx::Point point(1, 1);
   SimulateUpdateDrag(FolderGridView(), AppsGridView::MOUSE, dragged, point);
   EXPECT_FALSE(RootGridView()->has_dragged_view());
   EXPECT_FALSE(FolderGridView()->has_dragged_view());
 }
 
 }  // namespace test
 }  // namespace app_list