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diff --git a/chrome/browser/cocoa/themed_window.h b/chrome/browser/cocoa/themed_window.h
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+++ b/chrome/browser/cocoa/themed_window.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_THEMED_WINDOW_H_
+#define CHROME_BROWSER_COCOA_THEMED_WINDOW_H_
+
+#import <Cocoa/Cocoa.h>
+
+class ThemeProvider;
+
+// Bit flags; mix-and-match as necessary.
+enum {
+  THEMED_NORMAL    = 0,
+  THEMED_INCOGNITO = 1 << 0,
+  THEMED_POPUP     = 1 << 1,
+  THEMED_DEVTOOLS  = 1 << 2
+};
+typedef NSUInteger ThemedWindowStyle;
+
+// Implemented by windows that support theming.
+
+@interface NSWindow (ThemeProvider)
+- (ThemeProvider*)themeProvider;
+- (ThemedWindowStyle)themedWindowStyle;
+- (NSPoint)themePatternPhase;
+@end
+
+#endif  // CHROME_BROWSER_COCOA_THEMED_WINDOW_H_