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diff --git a/chrome/browser/ui/cocoa/fullscreen_window.mm b/chrome/browser/ui/cocoa/fullscreen_window.mm
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+// Copyright (c) 2010 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.
+
+#import "chrome/browser/ui/cocoa/fullscreen_window.h"
+
+#include "base/mac_util.h"
+#include "chrome/browser/themes/browser_theme_provider.h"
+#import "chrome/browser/ui/cocoa/themed_window.h"
+
+@implementation FullscreenWindow
+
+// Make sure our designated initializer gets called.
+- (id)init {
+  return [self initForScreen:[NSScreen mainScreen]];
+}
+
+- (id)initForScreen:(NSScreen*)screen {
+  NSRect contentRect;
+  contentRect.origin = NSZeroPoint;
+  contentRect.size = [screen frame].size;
+
+  if ((self = [super initWithContentRect:contentRect
+                               styleMask:NSBorderlessWindowMask
+                                 backing:NSBackingStoreBuffered
+                                   defer:YES
+                                  screen:screen])) {
+    [self setReleasedWhenClosed:NO];
+    // Borderless windows don't usually show up in the Windows menu so whine at
+    // Cocoa until it complies. See -dealloc and -setTitle: as well.
+    [NSApp addWindowsItem:self title:@"" filename:NO];
+  }
+  return self;
+}
+
+- (void)dealloc {
+  // Paranoia; doesn't seem to be necessary but it doesn't hurt.
+  [NSApp removeWindowsItem:self];
+
+  [super dealloc];
+}
+
+- (void)setTitle:(NSString *)title {
+  [NSApp changeWindowsItem:self title:title filename:NO];
+  [super setTitle:title];
+}
+
+// According to
+// http://www.cocoabuilder.com/archive/message/cocoa/2006/6/19/165953 ,
+// NSBorderlessWindowMask windows cannot become key or main.
+// In our case, however, we don't want that behavior, so we override
+// canBecomeKeyWindow and canBecomeMainWindow.
+
+- (BOOL)canBecomeKeyWindow {
+  return YES;
+}
+
+- (BOOL)canBecomeMainWindow {
+  return YES;
+}
+
+// When becoming/resigning main status, explicitly set the background color,
+// which is required by |TabView|.
+- (void)becomeMainWindow {
+  [super becomeMainWindow];
+  [self setBackgroundColor:[NSColor windowFrameColor]];
+}
+
+- (void)resignMainWindow {
+  [super resignMainWindow];
+  [self setBackgroundColor:[NSColor windowBackgroundColor]];
+}
+
+// We need our own version, since the default one wants to flash the close
+// button (and possibly other things), which results in nothing happening.
+- (void)performClose:(id)sender {
+  BOOL shouldClose = YES;
+
+  // If applicable, check if this window should close.
+  id delegate = [self delegate];
+  if ([delegate respondsToSelector:@selector(windowShouldClose:)])
+    shouldClose = [delegate windowShouldClose:self];
+
+  if (shouldClose) {
+    [self close];
+  }
+}
+
+- (BOOL)validateUserInterfaceItem:(id<NSValidatedUserInterfaceItem>)item {
+  SEL action = [item action];
+
+  // Explicitly enable |-performClose:| (see above); otherwise the fact that
+  // this window does not have a close button results in it being disabled.
+  if (action == @selector(performClose:))
+    return YES;
+
+  return [super validateUserInterfaceItem:item];
+}
+
+@end