Hook up the resize rect for Mac and enable its use in the renderer (mac-only)...

chrome/browser/browser_window_controller.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_BROWSER_WINDOW_CONTROLLER_H_
 #define CHROME_BROWSER_BROWSER_WINDOW_CONTROLLER_H_
 
 // A class acting as the Objective-C controller for the Browser object. Handles
 // interactions between Cocoa and the cross-platform code.
 
@@ skipping 37 matching lines @@
 // Updates the toolbar (and transitively the location bar) with the states of
 // the specified |tab|.  If |shouldRestore| is true, we're switching
 // (back?) to this tab and should restore any previous location bar state
 // (such as user editing) as well.
 - (void)updateToolbarWithContents:(TabContents*)tab
                shouldRestoreState:(BOOL)shouldRestore;
 
 // Sets whether or not the current page in the frontmost tab is bookmarked.
 - (void)setStarredState:(BOOL)isStarred;
 
+// Return the rect, in WebKit coordinates (flipped), of the window's grow box
+// in the coordinate system of the content area of the currently selected tab.
+// |windowGrowBox| needs to be in the window's coordinate system.
+- (NSRect)selectedTabGrowBoxFromWindowGrowBox:(NSRect)windowGrowBox;
+
 @end
 
 #endif  // CHROME_BROWSER_BROWSER_WINDOW_CONTROLLER_H_