AppListController refactoring part 1: AppListShower implementation.

ui/app_list/BUILD.gn

 # 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.
 
 import("//build/config/ui.gni")
 import("//testing/test.gni")
 
 component("app_list") {
   sources = [
     "app_list_constants.cc",
@@ skipping 160 matching lines @@
     deps += [
       "//ui/events",
       "//ui/views",
     ]
 
     public_deps = [
       "//ui/views",
     ]
   }
 
+  if (use_ash) {
+    sources += [
+      "app_list_shower.h",
+      "app_list_shower_delegate.h",
+      "app_list_shower_delegate_factory.h",
+      "app_list_shower_impl.cc",
+      "app_list_shower_impl.h",
+    ]
+  }
+
   if (is_mac) {
     sources += [
       "cocoa/app_list_pager_view.h",
       "cocoa/app_list_pager_view.mm",
       "cocoa/app_list_view_controller.h",
       "cocoa/app_list_view_controller.mm",
       "cocoa/app_list_window_controller.h",
       "cocoa/app_list_window_controller.mm",
       "cocoa/apps_collection_view_drag_manager.h",
       "cocoa/apps_collection_view_drag_manager.mm",
@@ skipping 13 matching lines @@
       "cocoa/scroll_view_with_no_scrollbars.h",
       "cocoa/scroll_view_with_no_scrollbars.mm",
     ]
     deps += [ "//third_party/google_toolbox_for_mac" ]
     libs = [ "QuartzCore.framework" ]
   }
 }
 
 static_library("test_support") {
   sources = [
+    "test/app_list_shower_impl_test_api.cc",
+    "test/app_list_shower_impl_test_api.h",
     "test/app_list_test_model.cc",
     "test/app_list_test_model.h",
     "test/app_list_test_view_delegate.cc",
     "test/app_list_test_view_delegate.h",
     "test/test_search_result.cc",
     "test/test_search_result.h",
   ]
 
   deps = [
     ":app_list",
@@ skipping 98 matching lines @@
       "views/speech_view_unittest.cc",
       "views/test/apps_grid_view_test_api.cc",
       "views/test/apps_grid_view_test_api.h",
     ]
     deps += [
       "//ui/views",
       "//ui/views:test_support",
     ]
   }
 
+  if (use_ash) {
+    sources += [ "app_list_shower_impl_unittest.cc" ]
+    deps += [
+      "//ui/aura:aura",
+      "//ui/aura:test_support",
+      "//ui/wm:wm",
+    ]
+  }
+
   if (is_mac) {
     sources += [
       "cocoa/app_list_view_controller_unittest.mm",
       "cocoa/app_list_window_controller_unittest.mm",
       "cocoa/apps_grid_controller_unittest.mm",
       "cocoa/apps_search_box_controller_unittest.mm",
       "cocoa/apps_search_results_controller_unittest.mm",
       "cocoa/test/apps_grid_controller_test_helper.h",
       "cocoa/test/apps_grid_controller_test_helper.mm",
     ]
   }
 }