linux_aura: Fix crash on drags from the omnibox.

ui/views/view.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_VIEWS_VIEW_H_
 #define UI_VIEWS_VIEW_H_
 
 #include <algorithm>
 #include <map>
 #include <set>
@@ skipping 1522 matching lines @@
 
   // Context menus -------------------------------------------------------------
 
   // The menu controller.
   ContextMenuController* context_menu_controller_;
 
   // Drag and drop -------------------------------------------------------------
 
   DragController* drag_controller_;
 
+  // True while we're performing DoDrag(). On X11, we can have multiple mouse
+  // move events in our event queue when we start a drag, so we need a way to
+  // ignore events after the first one.
+  bool currently_dragging_;
+
   // Input  --------------------------------------------------------------------
 
   scoped_ptr<internal::PostEventDispatchHandler> post_dispatch_handler_;
 
   // Accessibility -------------------------------------------------------------
 
   // Belongs to this view, but it's reference-counted on some platforms
   // so we can't use a scoped_ptr. It's dereferenced in the destructor.
   NativeViewAccessibility* native_view_accessibility_;
 
   DISALLOW_COPY_AND_ASSIGN(View);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_VIEW_H_