cocoa: allow omnibox decorations to become key

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

Index: chrome/browser/ui/cocoa/location_bar/autocomplete_text_field_cell.h
diff --git a/chrome/browser/ui/cocoa/location_bar/autocomplete_text_field_cell.h b/chrome/browser/ui/cocoa/location_bar/autocomplete_text_field_cell.h
index bc1e235c894c152f887f8c4b79bd85216284b750..dc0758ea121202ceb72d38c24ed26417fd174f17 100644
--- a/chrome/browser/ui/cocoa/location_bar/autocomplete_text_field_cell.h
+++ b/chrome/browser/ui/cocoa/location_bar/autocomplete_text_field_cell.h
@@ -139,6 +139,13 @@ class LocationBarDecoration;
 // 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.