[Mac] Detect control-key changes in autocomplete field.

chrome/browser/cocoa/autocomplete_text_field.h

 // Copyright (c) 2009 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_AUTOCOMPLETE_TEXT_FIELD_H_
 #define CHROME_BROWSER_COCOA_AUTOCOMPLETE_TEXT_FIELD_H_
 
 #import <Cocoa/Cocoa.h>
 
 // TODO(shess): This class will add decorations to support keyword
 // search and hints.  Adding as a stub so that I can clean up naming
 // around this code all at once before layering other changes over in
 // parallel.
 
 @protocol AutocompleteTextFieldDelegateMethods
 
 // Delegate -textShouldPaste: implementation to the field being
 // edited.  See AutocompleteTextFieldEditor implementation.
 - (BOOL)control:(NSControl*)control textShouldPaste:(NSText*)fieldEditor;
 
+// Let the delegate track -flagsChanged: events.
+- (void)control:(NSControl*)control flagsChanged:(NSEvent*)theEvent;
+
 @end
 
 @interface AutocompleteTextField : NSTextField {
 }
 
 - (BOOL)textShouldPaste:(NSText*)fieldEditor;
 
 @end
 
 #endif  // CHROME_BROWSER_COCOA_AUTOCOMPLETE_TEXT_FIELD_H_