Fix panel dragging on Linux Aura

ui/views/widget/desktop_aura/desktop_window_tree_host_x11.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_WIDGET_DESKTOP_AURA_DESKTOP_WINDOW_TREE_HOST_X11_H_
 #define UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_WINDOW_TREE_HOST_X11_H_
 
 #include <X11/extensions/shape.h>
 #include <X11/Xlib.h>
 
@@ skipping 204 matching lines @@
   ::Window xwindow_;
 
   // The native root window.
   ::Window x_root_window_;
 
   ui::X11AtomCache atom_cache_;
 
   // Is the window mapped to the screen?
   bool window_mapped_;
 
-  // The bounds of |xwindow_|.
+  // The bounds that were requested for |xwindow_|.

[sadrul, 2014/03/13 15:41:31]

This can be confusing (e.g. |bounds_| can also be the real bounds of
|xwindow_|). It would be better to merge the docs for |bounds_| and |x_bounds_|

   gfx::Rect bounds_;
 
+  // The actual bounds of |xwindow_|. |bounds_| and |x_bounds_| differ
+  // immediately after SetBounds() is called because SetBounds() does not
+  // synchronously change |xwindow_|'s bounds.
+  gfx::Rect x_bounds_;
+
   // Whenever the bounds are set, we keep the previous set of bounds around so
   // we can have a better chance of getting the real |restored_bounds_|. Window
   // managers tend to send a Configure message with the maximized bounds, and
   // then set the window maximized property. (We don't rely on this for when we
   // request that the window be maximized, only when we detect that some other
   // process has requested that we become the maximized window.)
   gfx::Rect previous_bounds_;
 
   // The bounds of our window before we were maximized.
   gfx::Rect restored_bounds_;
@@ skipping 53 matching lines @@
   scoped_ptr<X11ScopedCapture> x11_capture_;
 
   base::string16 window_title_;
 
   DISALLOW_COPY_AND_ASSIGN(DesktopWindowTreeHostX11);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_WINDOW_TREE_HOST_X11_H_