Some fixes to panel support on Windows:

chrome/browser/ui/panels/panel_manager.h

 // Copyright (c) 2011 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 CHROME_BROWSER_UI_PANELS_PANEL_MANAGER_H_
 #define CHROME_BROWSER_UI_PANELS_PANEL_MANAGER_H_
 #pragma once
 
 #include <vector>
 #include "base/basictypes.h"
@@ skipping 28 matching lines @@
   void EndDragging(bool cancelled);
 
   // Should we bring up the titlebar, given the current mouse point?
   bool ShouldBringUpTitlebarForAllMinimizedPanels(int mouse_x,
                                                   int mouse_y) const;
 
   // Brings up or down the title-bar for all minimized panels.
   void BringUpOrDownTitlebarForAllMinimizedPanels(bool bring_up);
 
   int num_panels() const { return panels_.size(); }
+  bool is_dragging_panel() const;
 
  private:
   friend class PanelBrowserTest;
 
   typedef std::vector<Panel*> Panels;
 
   PanelManager();
 
   // Applies the new work area. This is called by OnDisplayChanged and the test
   // code.
@@ skipping 49 matching lines @@
 
   // Bounds of the panel to drag. It is first set to the original bounds when
   // the dragging happens. Then it is updated to the position that will be set
   // to when the dragging ends.
   gfx::Rect dragging_panel_bounds_;
 
   DISALLOW_COPY_AND_ASSIGN(PanelManager);
 };
 
 #endif  // CHROME_BROWSER_UI_PANELS_PANEL_MANAGER_H_