mac: Refactor browser_window_controller layout logic.

chrome/browser/ui/cocoa/browser_window_controller.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_COCOA_BROWSER_WINDOW_CONTROLLER_H_
 #define CHROME_BROWSER_UI_COCOA_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. Each window has a single toolbar and, by virtue of being a
@@ skipping 283 matching lines @@
 // Returns YES if the bookmark bar is currently animating.
 - (BOOL)isBookmarkBarAnimating;
 
 - (BookmarkBarController*)bookmarkBarController;
 
 - (DevToolsController*)devToolsController;
 
 - (BOOL)isDownloadShelfVisible;
 
 // Lazily creates the download shelf in visible state if it doesn't exist yet.
+- (void)createAndAddDownloadShelf;
+
+// Returns the download shelf controller, if it exists.
 - (DownloadShelfController*)downloadShelf;
 
 // Retains the given FindBarCocoaController and adds its view to this
 // browser window.  Must only be called once per
 // BrowserWindowController.
 - (void)addFindBar:(FindBarCocoaController*)findBarCocoaController;
 
 // The user changed the theme.
 - (void)userChangedTheme;
 
@@ skipping 261 matching lines @@
 // positioned relative to.
 - (NSRect)omniboxPopupAnchorRect;
 
 // Force a layout of info bars.
 - (void)layoutInfoBars;
 
 @end  // @interface BrowserWindowController (TestingAPI)
 
 
 #endif  // CHROME_BROWSER_UI_COCOA_BROWSER_WINDOW_CONTROLLER_H_