diff -r 000000000000 -r 4f2f89ce4247 WebKit/mac/WebView/WebDynamicScrollBarsView.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WebKit/mac/WebView/WebDynamicScrollBarsView.h	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2005, 2008, 2010 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.
+ */
+
+// This is a Private header (containing SPI), despite the fact that its name
+// does not contain the word Private.
+
+#import <AppKit/NSScrollView.h>
+
+// FIXME: <rdar://problem/5898985> Mail currently expects this header to define WebCoreScrollbarAlwaysOn.
+extern const int WebCoreScrollbarAlwaysOn;
+
+struct WebDynamicScrollBarsViewPrivate;
+@interface WebDynamicScrollBarsView : NSScrollView {
+@private
+    struct WebDynamicScrollBarsViewPrivate *_private;
+
+#ifndef __OBJC2__
+    // We need to pad the class out to its former size.  See <rdar://problem/7814899> for more information.
+    char padding[16];
+#endif
+}
+
+// This was originally added for Safari's benefit, but Safari has not used it for a long time.
+// Perhaps it can be removed.
+- (void)setAllowsHorizontalScrolling:(BOOL)flag;
+
+// Determines whether the scrollers should be drawn outside of the content (as in normal scroll views)
+// or should overlap the content.
+- (void)setAllowsScrollersToOverlapContent:(BOOL)flag;
+
+// These methods hide the scrollers in a way that does not prevent scrolling.
+- (void)setAlwaysHideHorizontalScroller:(BOOL)flag;
+- (void)setAlwaysHideVerticalScroller:(BOOL)flag;
+
+// These methods return YES if the scrollers are visible, or if the only reason that they are not
+// visible is that they have been suppressed by setAlwaysHideHorizontal/VerticalScroller:.
+- (BOOL)horizontalScrollingAllowed;
+- (BOOL)verticalScrollingAllowed;
+@end