Draggable region support for frameless app window on Windows.

chrome/browser/ui/base_window.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_BASE_WINDOW_H_
 #define CHROME_BROWSER_UI_BASE_WINDOW_H_
 
 #include "base/compiler_specific.h"
 #include "ui/gfx/native_widget_types.h"
 
@@ skipping 52 matching lines @@
   virtual void Deactivate() = 0;
 
   // Maximizes/minimizes/restores the window.
   virtual void Maximize() = 0;
   virtual void Minimize() = 0;
   virtual void Restore() = 0;
 
   // Sets the window's size and position to the specified values.
   virtual void SetBounds(const gfx::Rect& bounds) = 0;
 
-  // The specified region will act like the window's caption area, meaning that
-  // the user will be able to move the window by dragging in that area. (On
-  // Windows, they will also be able to maximize the window by double-clicking
-  // it, and show the system menu by right-clicking it.)
-  // Currently only implemented by ShellWindow.
-  virtual void SetDraggableRegion(SkRegion* region) = 0;
-
   // Flashes the taskbar item associated with this window.
   // Set |flash| to true to initiate flashing, false to stop flashing.
   virtual void FlashFrame(bool flash) = 0;
 
   // Returns true if a window is set to be always on top.
   virtual bool IsAlwaysOnTop() const = 0;
 };
 
 #endif  // CHROME_BROWSER_UI_BASE_WINDOW_H_