[Mac] Window titles for Expose.

chrome/browser/cocoa/chrome_browser_window.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_CHROME_BROWSER_WINDOW_H_
+#define CHROME_BROWSER_COCOA_CHROME_BROWSER_WINDOW_H_
+
+#import <Cocoa/Cocoa.h>
+
+// Cocoa class representing a Chrome browser window.
+// We need to override NSWindow with our own class since we need access to all
+// unhandled keyboard events and subclassing NSWindow is the only method to do
+// this.
+@interface ChromeBrowserWindow : NSWindow {
+  BOOL shouldHideTitle_;
+}
+
+// Override, so we can handle global keyboard events.
+- (BOOL)performKeyEquivalent:(NSEvent*)theEvent;
+
+// Tells the window to suppress title drawing.
+- (void)setShouldHideTitle:(BOOL)flag;
+
+@end
+
+@interface ChromeBrowserWindow (UndocumentedAPI)
+
+// Undocumented Cocoa API to suppress drawing of the window's title.
+// -setTitle: still works, but the title set only applies to the
+// miniwindow and menus (and, importantly, Expose).  Overridden to
+// return |shouldHideTitle_|.
+-(BOOL)_isTitleHidden;
+
+@end
+
+#endif  // CHROME_BROWSER_COCOA_CHROME_BROWSER_WINDOW_H_