cocoa: allow omnibox decorations to become key

chrome/browser/ui/cocoa/location_bar/autocomplete_text_field_cell.h

 // 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_UI_COCOA_LOCATION_BAR_AUTOCOMPLETE_TEXT_FIELD_CELL_H_
 #define CHROME_BROWSER_UI_COCOA_LOCATION_BAR_AUTOCOMPLETE_TEXT_FIELD_CELL_H_
 
 #include <vector>
 
 #import <Cocoa/Cocoa.h>
@@ skipping 121 matching lines @@
 
 // Gets and sets |hideFocusState|. This allows the text field to have focus but
 // to appear unfocused.
 - (BOOL)hideFocusState;
 - (void)setHideFocusState:(BOOL)hideFocusState
                    ofView:(AutocompleteTextField*)controlView;
 
 // Handles the |event| that caused |controlView| to become firstResponder.
 - (void)handleFocusEvent:(NSEvent*)event
                   ofView:(AutocompleteTextField*)controlView;
+
+// Returns the index of |decoration| as a leading decoration, if it is one. The
+// leading-most decoration is at index zero, and increasing indices are closer
+// to the start of the omnibox text field. Returns -1 if |decoration| is not a
+// leading decoration.
+- (int)leadingDecorationIndex:(LocationBarDecoration*)decoration;
+
 @end
 
 // Methods which are either only for testing, or only public for testing.
 @interface AutocompleteTextFieldCell (TestingAPI)
 
 // Returns |mouseTrackingDecorations_|.
 - (const std::vector<LocationBarDecoration*>&)mouseTrackingDecorations;
 
 @end
 
 #endif  // CHROME_BROWSER_UI_COCOA_LOCATION_BAR_AUTOCOMPLETE_TEXT_FIELD_CELL_H_