Check for NULL NativeView in linux/mac Screen::GetDisplayNearestWindow().

ui/gfx/screen.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_GFX_SCREEN_H_
 #define UI_GFX_SCREEN_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 53 matching lines @@
 
   // Returns the number of displays.
   // Mirrored displays are excluded; this method is intended to return the
   // number of distinct, usable displays.
   virtual int GetNumDisplays() const = 0;
 
   // Returns the list of displays that are currently available.
   virtual std::vector<gfx::Display> GetAllDisplays() const = 0;
 
   // Returns the display nearest the specified window.
+  // If the window is NULL or the window is not rooted to a display this will

[lazyboy, 2014/10/02 16:16:21]

I've added this comment, if that's what you meant.

+  // return the primary display.
   virtual gfx::Display GetDisplayNearestWindow(NativeView view) const = 0;
 
   // Returns the display nearest the specified point.
   virtual gfx::Display GetDisplayNearestPoint(
       const gfx::Point& point) const = 0;
 
   // Returns the display that most closely intersects the provided bounds.
   virtual gfx::Display GetDisplayMatching(
       const gfx::Rect& match_rect) const = 0;
 
   // Returns the primary display.
   virtual gfx::Display GetPrimaryDisplay() const = 0;
 
   // Adds/Removes display observers.
   virtual void AddObserver(DisplayObserver* observer) = 0;
   virtual void RemoveObserver(DisplayObserver* observer) = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(Screen);
 };
 
 Screen* CreateNativeScreen();
 
 }  // namespace gfx
 
 #endif  // UI_GFX_SCREEN_H_