Enabled pressing TAB to cycle through the Omnibox results.

ui/base/keycodes/keyboard_code_conversion_mac.mm

 // Copyright (c) 2011 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.
 
 #import "ui/base/keycodes/keyboard_code_conversion_mac.h"
 
 #include <algorithm>
 #import <Carbon/Carbon.h>
 
 #include "base/logging.h"
@@ skipping 13 matching lines @@
 bool operator<(const KeyCodeMap& a, const KeyCodeMap& b) {
   return a.keycode < b.keycode;
 }
 
 // This array must keep sorted ascending according to the value of |keycode|,
 // so that we can binary search it.
 // TODO(suzhe): This map is not complete, missing entries have macKeycode == -1.
 const KeyCodeMap kKeyCodesMap[] = {
   { VKEY_BACK /* 0x08 */, kVK_Delete, kBackspaceCharCode },
   { VKEY_TAB /* 0x09 */, kVK_Tab, kTabCharCode },
+  { VKEY_BACKTAB /* 0x0A */, 0x21E4, '\031' },

[Peter Kasting, 2012/01/24 19:14:44]

Where do these values come from?  (I noticed for example that some public Qt
file uses "kTabCharCode" where you used \031.)

[aaron.randolph, 2012/01/24 21:18:34]

That would make sense.  I got the other value from
http://www.cocoadev.com/index.pl?AppleSpecificCodePoints.  I could not find any
apple-defined const for a backtab.  When the tests sent a SHIFT+TAB, it wasn't
getting converted to a backtab, so I saw this as the only way to go (with my
limited knowledge).   

   { VKEY_CLEAR /* 0x0C */, kVK_ANSI_KeypadClear, kClearCharCode },
   { VKEY_RETURN /* 0x0D */, kVK_Return, kReturnCharCode },
   { VKEY_SHIFT /* 0x10 */, kVK_Shift, 0 },
   { VKEY_CONTROL /* 0x11 */, kVK_Control, 0 },
   { VKEY_MENU /* 0x12 */, kVK_Option, 0 },
   { VKEY_PAUSE /* 0x13 */, -1, NSPauseFunctionKey },
   { VKEY_CAPITAL /* 0x14 */, kVK_CapsLock, 0 },
   { VKEY_KANA /* 0x15 */, kVK_JIS_Kana, 0 },
   { VKEY_HANGUL /* 0x15 */, -1, 0 },
   { VKEY_JUNJA /* 0x17 */, -1, 0 },
@@ skipping 503 matching lines @@
     characters = [event charactersIgnoringModifiers];
     if ([characters length] > 0)
       code = KeyboardCodeFromCharCode([characters characterAtIndex:0]);
     if (code)
       return code;
   }
   return KeyboardCodeFromKeyCode([event keyCode]);
 }
 
 }  // namespace ui