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diff --git a/chrome/browser/cocoa/reload_button.h b/chrome/browser/cocoa/reload_button.h
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+++ b/chrome/browser/cocoa/reload_button.h
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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.
+
+#ifndef CHROME_BROWSER_COCOA_RELOAD_BUTTON_H_
+#define CHROME_BROWSER_COCOA_RELOAD_BUTTON_H_
+
+#import <Cocoa/Cocoa.h>
+
+#import "base/scoped_nsobject.h"
+
+// NSButton subclass which defers certain state changes when the mouse
+// is hovering over it.
+
+@interface ReloadButton : NSButton {
+ @private
+  // Tracks whether the mouse is hovering for purposes of not making
+  // unexpected state changes.
+  BOOL isMouseInside_;
+  scoped_nsobject<NSTrackingArea> trackingArea_;
+
+  // Set when reload mode is requested, but not forced, and the mouse
+  // is hovering.
+  BOOL pendingReloadMode_;
+}
+
+// Returns YES if the mouse is currently inside the bounds.
+- (BOOL)isMouseInside;
+
+// Update the button to be a reload button or stop button depending on
+// |isLoading|.  If |force|, always sets the indicated mode.  If
+// |!force|, and the mouse is over the button, defer the transition
+// from stop button to reload button until the mouse has left the
+// button.  This prevents an inadvertent click _just_ as the state
+// changes.
+- (void)setIsLoading:(BOOL)isLoading force:(BOOL)force;
+
+@end
+
+@interface ReloadButton (PrivateTestingMethods)
+- (NSTrackingArea*)trackingArea;
+@end
+
+#endif  // CHROME_BROWSER_COCOA_RELOAD_BUTTON_H_