Interpret '?' and Ctrl-K or Ctrl-E as putting omnibox in keyword search mode for Default Search Pro…

chrome/browser/ui/cocoa/omnibox/omnibox_view_mac.h

 // Copyright (c) 2012 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_OMNIBOX_OMNIBOX_VIEW_MAC_H_
 #define CHROME_BROWSER_UI_COCOA_OMNIBOX_OMNIBOX_VIEW_MAC_H_
 
 #import <Cocoa/Cocoa.h>
 #include <stddef.h>
 
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   AutocompleteTextField* field_;  // owned by tab controller
 
   // Selection at the point where the user started using the
   // arrows to move around in the popup.
   NSRange saved_temporary_selection_;
 
   // Tracking state before and after a possible change for reporting
   // to model_.
   NSRange selection_before_change_;
   base::string16 text_before_change_;
+  base::string16 keyword_before_change_;
+  bool is_keyword_selected_before_change_;
   NSRange marked_range_before_change_;
 
   // Was delete pressed?
   bool delete_was_pressed_;
 
   // Was the delete key pressed with an empty selection at the end of the edit?
   bool delete_at_end_pressed_;
 
   base::string16 suggest_text_;
 
   // State used to coalesce changes to text and selection to avoid drawing
   // transient state.
   bool in_coalesced_update_block_;
   bool do_coalesced_text_update_;
   base::string16 coalesced_text_update_;
   bool do_coalesced_range_update_;
   NSRange coalesced_range_update_;
 
   // The time of the first character insert operation that has not yet been
   // painted. Used to measure omnibox responsiveness with a histogram.
   base::TimeTicks insert_char_time_;
 
   DISALLOW_COPY_AND_ASSIGN(OmniboxViewMac);
 };
 
 #endif  // CHROME_BROWSER_UI_COCOA_OMNIBOX_OMNIBOX_VIEW_MAC_H_