AppListController refactoring part 1: AppListShower implementation.

ui/app_list/app_list_shower_delegate.h

Index: ui/app_list/app_list_shower_delegate.h
diff --git a/ui/app_list/app_list_shower_delegate.h b/ui/app_list/app_list_shower_delegate.h
new file mode 100644
index 0000000000000000000000000000000000000000..9e29f3aebd26a58c3376f883c2fa9fffe34eed6f
--- /dev/null
+++ b/ui/app_list/app_list_shower_delegate.h
@@ -0,0 +1,55 @@
+// Copyright 2016 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.
+
+#ifndef UI_APP_LIST_SHOWER_APP_LIST_SHOWER_DELEGATE_H_
+#define UI_APP_LIST_SHOWER_APP_LIST_SHOWER_DELEGATE_H_
+
+#include "ui/app_list/shower/app_list_shower_export.h"
+
+namespace aura {
+class Window;
+}
+
+namespace gfx {
+class Vector2d;
+}
+
+namespace app_list {
+
+class AppListView;
+class AppListViewDelegate;
+
+// Delegate of AppListShower which allows to customize AppListShower's behavior.
+// The design of this interface was heavily influenced by the needs of Ash's
+// app list implementation (see ash::AppListShowerDelegate).
+class APP_LIST_SHOWER_EXPORT AppListShowerDelegate {
+ public:
+  virtual ~AppListShowerDelegate() {}
+
+  // Returns the delegate for the app list view, possibly creating one.
+  virtual AppListViewDelegate* GetViewDelegate() = 0;
+
+  // Called to initialize the layout of the app list.
+  void virtual Init(AppListView* view,

[xiyuan, 2016/04/04 17:09:30]

nit: not sure how I missed this. The prevailing style is to put "virtual" first.

[mfomitchev, 2016/04/04 18:59:06]

Done.

+                    aura::Window* root_window,
+                    int current_apps_page) = 0;
+
+  // Called when app list is shown.
+  void virtual OnShown(aura::Window* root_window) = 0;
+
+  // Called when app list is dismissed
+  void virtual OnDismissed() = 0;
+
+  // Update app list bounds if necessary.
+  void virtual UpdateBounds() = 0;
+
+  // Returns the offset vector by which the app list window should animate
+  // when it gets hidden.
+  virtual gfx::Vector2d GetVisibilityAnimationOffset(
+      aura::Window* root_window) = 0;
+};
+
+}  // namespace app_list
+
+#endif  // UI_APP_LIST_SHOWER_APP_LIST_SHOWER_DELEGATE_H_