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

chrome/browser/tab_contents/tab_contents.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_TAB_CONTENTS_TAB_CONTENTS_H_
 #define CHROME_BROWSER_TAB_CONTENTS_TAB_CONTENTS_H_
 
 #include "build/build_config.h"
 
 #include <map>
@@ skipping 319 matching lines @@
   // Tell Gears to create a shortcut for the current page.
   void CreateShortcut();
 
   // Shows the page info.
   void ShowPageInfo(const GURL& url,
                     const NavigationEntry::SSLStatus& ssl,
                     bool show_history);
 
   // Window management ---------------------------------------------------------
 
-#if defined(OS_WIN) || defined(OS_LINUX)
   // Create a new window constrained to this TabContents' clip and visibility.
   // The window is initialized by using the supplied delegate to obtain basic
   // window characteristics, and the supplied view for the content. The window
   // is sized according to the preferred size of the content_view, and centered
   // within the contents.
   ConstrainedWindow* CreateConstrainedDialog(
       ConstrainedWindowDelegate* delegate);
-#endif
 
   // Adds a new tab or window with the given already-created contents
   void AddNewContents(TabContents* new_contents,
                       WindowOpenDisposition disposition,
                       const gfx::Rect& initial_pos,
                       bool user_gesture,
                       const GURL& creator_url);
 
   // Closes all constrained windows that represent web popups that have not yet
   // been activated by the user and are as such auto-positioned in the bottom
   // right of the screen. This is a quick way for users to "clean up" a flurry
   // of unwanted popups.
   void CloseAllSuppressedPopups();
 
   // Called when the blocked popup notification is shown or hidden.
   virtual void PopupNotificationVisibilityChanged(bool visible);
 
   // Returns the number of constrained windows in this tab.  Used by tests.
   size_t constrained_window_count() { return child_windows_.size(); }
 
+  typedef std::vector<ConstrainedWindow*> ConstrainedWindowList;
+
+  // Return an iterator for the first constrained window in this tab contents.
+  ConstrainedWindowList::iterator constrained_window_begin()
+  { return child_windows_.begin(); }
+
+  // Return an iterator for the last constrained window in this tab contents.
+  ConstrainedWindowList::iterator constrained_window_end()
+  { return child_windows_.end(); }
+
   // Views and focus -----------------------------------------------------------
   // TODO(brettw): Most of these should be removed and the caller should call
   // the view directly.
 
   // Returns the actual window that is focused when this TabContents is shown.
   gfx::NativeView GetContentNativeView();
 
   // Returns the NativeView associated with this TabContents. Outside of
   // automation in the context of the UI, this is required to be implemented.
   gfx::NativeView GetNativeView() const;
@@ skipping 274 matching lines @@
   void set_blocked_popup_container(BlockedPopupContainer* container) {
     DCHECK(blocked_popups_ == NULL);
     blocked_popups_ = container;
   }
 
   // Called by derived classes to indicate that we're no longer waiting for a
   // response. This won't actually update the throbber, but it will get picked
   // up at the next animation step if the throbber is going.
   void SetNotWaitingForResponse() { waiting_for_response_ = false; }
 
-  typedef std::vector<ConstrainedWindow*> ConstrainedWindowList;
   ConstrainedWindowList child_windows_;
 
   // Expires InfoBars that need to be expired, according to the state carried
   // in |details|, in response to a new NavigationEntry being committed (the
   // user navigated to another page).
   void ExpireInfoBars(
       const NavigationController::LoadCommittedDetails& details);
 
   // Called when the user dismisses the shortcut creation dialog.  'success' is
   // true if the shortcut was created.
@@ skipping 426 matching lines @@
 
   // Settings that get passed to the renderer process.
   RendererPreferences renderer_preferences_;
 
   // ---------------------------------------------------------------------------
 
   DISALLOW_COPY_AND_ASSIGN(TabContents);
 };
 
 #endif  // CHROME_BROWSER_TAB_CONTENTS_TAB_CONTENTS_H_