Use centered app list position whenever virtual keyboard is enabled.

ui/app_list/app_list_view_delegate.h

 // Copyright (c) 2012 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_APP_LIST_VIEW_DELEGATE_H_
 #define UI_APP_LIST_APP_LIST_VIEW_DELEGATE_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 131 matching lines @@
   // Get the start page web contents. Owned by the AppListViewDelegate.
   virtual content::WebContents* GetStartPageContents() = 0;
 
   // Get the web contents for speech recognition or NULL if speech recognition
   // is unavailable.
   virtual content::WebContents* GetSpeechRecognitionContents() = 0;
 
   // Returns the list of users (for AppListMenu).
   virtual const Users& GetUsers() const = 0;
 
+  // Returns true if the app list should be centered and in landscape mode.
+  virtual bool ShouldCenterWindow() const = 0;
+
   // Adds/removes an observer for profile changes.
   virtual void AddObserver(AppListViewDelegateObserver* observer) {}
   virtual void RemoveObserver(AppListViewDelegateObserver* observer) {}
 };
 
 }  // namespace app_list
 
 #endif  // UI_APP_LIST_APP_LIST_VIEW_DELEGATE_H_