Handles users rotating screen too early

ui/display/manager/display_manager.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_DISPLAY_MANAGER_DISPLAY_MANAGER_H_
 #define UI_DISPLAY_MANAGER_DISPLAY_MANAGER_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 120 matching lines @@
   // Returns the actual display layout after it has been resolved and applied.
   const DisplayLayout& GetCurrentResolvedDisplayLayout() const;
 
   // Returns the current display list.
   DisplayIdList GetCurrentDisplayIdList() const;
 
   // Sets the layout for the current display pair. The |layout| specifies the
   // locaion of the displays relative to their parents.
   void SetLayoutForCurrentDisplays(std::unique_ptr<DisplayLayout> layout);
 
-  // Returns display for given |id|;
-  const Display& GetDisplayForId(int64_t id) const;
+  // Returns display for given |display_id|.
+  const Display& GetDisplayForId(int64_t display_id) const;
+
+  // Checks the validity of given |display_id|.
+  bool IsDisplayIdValid(int64_t display_id) const;
 
   // Finds the display that contains |point| in screeen coordinates.  Returns
   // invalid display if there is no display that can satisfy the condition.
   const Display& FindDisplayContainingPoint(
       const gfx::Point& point_in_screen) const;
 
   // Sets the work area's |insets| to the display given by |display_id|.
   bool UpdateWorkAreaOfDisplay(int64_t display_id, const gfx::Insets& insets);
 
   // Registers the overscan insets for the display of the specified ID. Note
@@ skipping 326 matching lines @@
   base::ObserverList<DisplayObserver> observers_;
 
   base::WeakPtrFactory<DisplayManager> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DisplayManager);
 };
 
 }  // namespace display
 
 #endif  // UI_DISPLAY_MANAGER_DISPLAY_MANAGER_H_