linux_aura: Implement dropping in chrome.

ui/base/x/x11_util.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_BASE_X_X11_UTIL_H_
 #define UI_BASE_X_X11_UTIL_H_
 
 // This file declares utility functions for X11 (Linux only).
 //
 // These functions do not require the Xlib headers to be included (which is why
@@ skipping 147 matching lines @@
 UI_EXPORT bool GetWindowRect(XID window, gfx::Rect* rect);
 
 // Returns true if |window| contains the point |screen_loc|.
 UI_EXPORT bool WindowContainsPoint(XID window, gfx::Point screen_loc);
 
 // Return true if |window| has any property with |property_name|.
 UI_EXPORT bool PropertyExists(XID window, const std::string& property_name);
 
 // Get the value of an int, int array, atom array or string property.  On
 // success, true is returned and the value is stored in |value|.
+//
+// TODO(erg): Once we remove the gtk port and are 100% aura, all of these
+// should accept an Atom instead of a string.
 UI_EXPORT bool GetIntProperty(XID window, const std::string& property_name,
                               int* value);
 UI_EXPORT bool GetIntArrayProperty(XID window, const std::string& property_name,
                                    std::vector<int>* value);
 UI_EXPORT bool GetAtomArrayProperty(XID window,
                                     const std::string& property_name,
                                     std::vector<Atom>* value);
 UI_EXPORT bool GetStringProperty(
     XID window, const std::string& property_name, std::string* value);
 
@@ skipping 219 matching lines @@
  private:
   ::Cursor cursor_;
   Display* display_;
 
   DISALLOW_COPY_AND_ASSIGN(XScopedCursor);
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_X_X11_UTIL_H_