Support dragging panels to stack and snap.

chrome/browser/ui/views/panels/panel_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 CHROME_BROWSER_UI_VIEWS_PANELS_PANEL_VIEW_H_
 #define CHROME_BROWSER_UI_VIEWS_PANELS_PANEL_VIEW_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/ui/panels/native_panel.h"
 #include "ui/base/animation/animation_delegate.h"
@@ skipping 51 matching lines @@
   virtual void PanelExpansionStateChanging(
       Panel::ExpansionState old_state,
       Panel::ExpansionState new_state) OVERRIDE;
   virtual void AttachWebContents(content::WebContents* contents) OVERRIDE;
   virtual void DetachWebContents(content::WebContents* contents) OVERRIDE;
   virtual gfx::Size WindowSizeFromContentSize(
       const gfx::Size& content_size) const OVERRIDE;
   virtual gfx::Size ContentSizeFromWindowSize(
       const gfx::Size& window_size) const OVERRIDE;
   virtual int TitleOnlyHeight() const OVERRIDE;
+  virtual void UpdatePanelStackingProperty() OVERRIDE;
   virtual NativePanelTesting* CreateNativePanelTesting() OVERRIDE;
 
   // Return true if the mouse event is handled.
   // |mouse_location| is in screen coordinate system.
   bool OnTitlebarMousePressed(const gfx::Point& mouse_location);
   bool OnTitlebarMouseDragged(const gfx::Point& mouse_location);
   bool OnTitlebarMouseReleased(panel::ClickModifier modifier);
   bool OnTitlebarMouseCaptureLost();
 
   PanelFrameView* GetFrameView() const;
@@ skipping 123 matching lines @@
 
 #if defined(OS_WIN) && !defined(USE_ASH) && !defined(USE_AURA)
   // Used to provide custom taskbar thumbnail for Windows 7 and later.
   scoped_ptr<TaskbarWindowThumbnailerWin> thumbnailer_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(PanelView);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_PANELS_PANEL_VIEW_H_