Add autoclick to settings page under the accessibility section.

chromeos/chromeos_switches.cc

Index: chromeos/chromeos_switches.cc
diff --git a/chromeos/chromeos_switches.cc b/chromeos/chromeos_switches.cc
index f9d719d916b7f5f74485d622b643254f36515f5e..827849d8d07cbe527b2c8b7b4918f1e30a05287e 100644
--- a/chromeos/chromeos_switches.cc
+++ b/chromeos/chromeos_switches.cc
@@ -73,6 +73,9 @@ const char kDisableStubEthernet[] = "disable-stub-ethernet";
 // Useful for testing.
 const char kEchoExtensionPath[]             = "echo-ext-path";
 
+// Enables settings ui to control the autoclick accessibility feature.
+const char kEnableAutoclick[]               = "enable-autoclick";
+
 // Enables component extension that initializes background pages of
 // certain hosted applications.
 const char kEnableBackgroundLoader[]        = "enable-background-loader";