[Aura] Refactor and update app list window.

ui/aura_shell/shell_delegate.h

Index: ui/aura_shell/shell_delegate.h
diff --git a/ui/aura_shell/shell_delegate.h b/ui/aura_shell/shell_delegate.h
index b31666970376c2d4b6b507760b85a8ba57578e94..0e3e3e908769fb1d3a84a55a67ccecdfe61f5271 100644
--- a/ui/aura_shell/shell_delegate.h
+++ b/ui/aura_shell/shell_delegate.h
@@ -6,6 +6,7 @@
 #define UI_AURA_SHELL_SHELL_DELEGATE_H_
 #pragma once
 
+#include "base/callback.h"
 #include "ui/aura_shell/aura_shell_export.h"
 
 namespace views {
@@ -15,6 +16,7 @@ class Widget;
 namespace aura_shell {
 
 struct LauncherItem;
+typedef base::Callback<void(views::Widget*)> SetWidgetCallback;

[sky, 2011/11/19 00:13:14]

Move this inside of ShellDelegate.

[xiyuan, 2011/11/19 00:25:04]

Done.

 
 // Delegate of the Shell.
 class AURA_SHELL_EXPORT ShellDelegate {
@@ -29,8 +31,9 @@ class AURA_SHELL_EXPORT ShellDelegate {
   // Invoked to create a new status area. Can return NULL.
   virtual views::Widget* CreateStatusArea() = 0;
 
-  // Invoked when the user clicks the app list button on the launcher.
-  virtual void ShowApps() = 0;
+  // Invoked to create app list widget. The Delegate calls the callback
+  // when the widget is ready to show.
+  virtual void RequestAppListWidget(const SetWidgetCallback& callback) = 0;
 
   // Invoked when the user clicks on a window entry in the launcher.
   virtual void LauncherItemClicked(const LauncherItem& item) = 0;