[rAc OSX] Factor out AutofillHeader class to contain dialog header elements.

chrome/browser/ui/cocoa/autofill/autofill_header.h

+// Copyright 2013 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_UI_COCOA_AUTOFILL_AUTOFILL_HEADER_H_
+#define CHROME_BROWSER_UI_COCOA_AUTOFILL_AUTOFILL_HEADER_H_
+
+#import <Cocoa/Cocoa.h>
+
+#include "base/mac/scoped_nsobject.h"
+#import "chrome/browser/ui/cocoa/autofill/autofill_layout.h"
+
+namespace autofill {
+class AutofillDialogViewDelegate;
+}  // autofill
+
+@class AutofillAccountChooser;
+
+@interface AutofillHeader : NSView<AutofillLayout> {
+ @private
+  base::scoped_nsobject<AutofillAccountChooser> accountChooser_;
+  base::scoped_nsobject<NSTextField> title_;
+  // TODO(isherman): Include notifications in the header.
+
+  autofill::AutofillDialogViewDelegate* delegate_;  // not owned, owns dialog.
+}
+
+// Designated initializer.
+- (id)initWithDelegate:(autofill::AutofillDialogViewDelegate*)delegate;
+
+// Returns the anchor view for notifications, which is the middle of the account
+// chooser view.
+- (NSView*)anchorView;
+
+// Updates the header's state from the dialog controller.
+- (void)update;
+
+// Get the preferred view height for a given width.
+- (CGFloat)heightForWidth:(int)width;
+
+@end
+
+#endif  // CHROME_BROWSER_UI_COCOA_AUTOFILL_AUTOFILL_DIALOG_HEADER_H_