Introduce StickyKeys settings item with behind flag.

chrome/common/chrome_switches.cc

Index: chrome/common/chrome_switches.cc
diff --git a/chrome/common/chrome_switches.cc b/chrome/common/chrome_switches.cc
index ab6e811e753417a14cd66d848513a2882e4d8a36..b3b215812e33d3371fd4d503d4c2538ca01cf08c 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -666,6 +666,10 @@ const char kEnableSavePasswordBubble[]      = "enable-save-password-bubble";
 // supported server-side for searches on google.com.
 const char kEnableSdch[]                    = "enable-sdch";
 
+// Enables support of sticky keys.
+// TODO(nona): Remove this switch and make this as default.

[James Hawkins, 2013/07/22 15:37:49]

Optional nit: This TODO is superfluous so consider removing it.

[Seigo Nonaka, 2013/07/23 07:10:02]

Done.

+const char kEnableStickyKeys[]              = "enable-sticky-keys";
+
 // Disable SPDY/3.1. This is a temporary testing flag.
 const char kDisableSpdy31[]                 = "disable-spdy31";