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diff --git a/Source/WebKit2/UIProcess/mac/WKFullKeyboardAccessWatcher.mm b/Source/WebKit2/UIProcess/mac/WKFullKeyboardAccessWatcher.mm
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+++ b/Source/WebKit2/UIProcess/mac/WKFullKeyboardAccessWatcher.mm
@@ -0,0 +1,86 @@
+/*
+ * Copyright (C) 2011 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#import "config.h"
+#import "WKFullKeyboardAccessWatcher.h"
+
+#import "WebContext.h"
+
+NSString * const KeyboardUIModeDidChangeNotification = @"com.apple.KeyboardUIModeDidChange";
+const CFStringRef AppleKeyboardUIMode = CFSTR("AppleKeyboardUIMode");
+const CFStringRef UniversalAccessDomain = CFSTR("com.apple.universalaccess");
+
+using namespace WebKit;
+
+@implementation WKFullKeyboardAccessWatcher
+
+- (void)notifyAllWebContexts
+{
+    const Vector<WebContext*>& contexts = WebContext::allContexts();
+    for (size_t i = 0; i < contexts.size(); ++i)
+        contexts[i]->fullKeyboardAccessModeChanged(fullKeyboardAccessEnabled);
+}
+
+- (void)retrieveKeyboardUIModeFromPreferences:(NSNotification *)notification
+{
+    BOOL oldValue = fullKeyboardAccessEnabled;
+
+    CFPreferencesAppSynchronize(UniversalAccessDomain);
+
+    Boolean keyExistsAndHasValidFormat;
+    int mode = CFPreferencesGetAppIntegerValue(AppleKeyboardUIMode, UniversalAccessDomain, &keyExistsAndHasValidFormat);
+    if (keyExistsAndHasValidFormat) {
+        // The keyboard access mode is reported by two bits:
+        // Bit 0 is set if feature is on
+        // Bit 1 is set if full keyboard access works for any control, not just text boxes and lists.
+        fullKeyboardAccessEnabled = (mode & 0x2);
+    }
+
+    if (fullKeyboardAccessEnabled != oldValue)
+        [self notifyAllWebContexts];
+}
+
+- (id)init
+{
+    self = [super init];
+    if (!self)
+        return nil;
+
+    [self retrieveKeyboardUIModeFromPreferences:nil];
+
+    [[NSDistributedNotificationCenter defaultCenter] 
+        addObserver:self selector:@selector(retrieveKeyboardUIModeFromPreferences:) 
+        name:KeyboardUIModeDidChangeNotification object:nil];
+
+    return self;
+}
+
++ (BOOL)fullKeyboardAccessEnabled
+{
+    static WKFullKeyboardAccessWatcher *watcher = [[WKFullKeyboardAccessWatcher alloc] init];
+    return watcher->fullKeyboardAccessEnabled;
+}
+
+@end