Mac fullscreen mode (with pkasting).

chrome/browser/cocoa/fullscreen_window.mm

+// 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.
+
+#include "chrome/browser/cocoa/fullscreen_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];
+  }
+  return self;
+}
+
+// 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;
+}
+
+@end