Add support for constrained windows on os x, based on Avi's GTMWindowSheetController.

chrome/browser/cocoa/browser_window_cocoa.h

 // Copyright (c) 2009 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_COCOA_BROWSER_WINDOW_COCOA_H_
 #define CHROME_BROWSER_COCOA_BROWSER_WINDOW_COCOA_H_
 
 #include "chrome/browser/browser_window.h"
 #include "chrome/browser/bookmarks/bookmark_model.h"
 #include "chrome/common/notification_registrar.h"
@@ skipping 72 matching lines @@
                             bool show_history);
 
   // Overridden from NotificationObserver
   virtual void Observe(NotificationType type,
                        const NotificationSource& source,
                        const NotificationDetails& details);
 
   // Adds the given FindBar cocoa controller to this browser window.
   void AddFindBar(FindBarCocoaController* find_bar_cocoa_controller);
 
+  // Returns the cocoa-world BrowserWindowController
+  BrowserWindowController* cocoa_controller() { return controller_; }
+
  protected:
   virtual void DestroyBrowser();
 
  private:
   NotificationRegistrar registrar_;
   NSWindow* window_;  // weak, owned by controller
   Browser* browser_;  // weak, owned by controller
   BrowserWindowController* controller_;  // weak, owns us
 };
 
 #endif  // CHROME_BROWSER_COCOA_BROWSER_WINDOW_COCOA_H_