Add 5 experimental accessibility features on Chrome OS.

chromeos/chromeos_switches.cc

Index: chromeos/chromeos_switches.cc
diff --git a/chromeos/chromeos_switches.cc b/chromeos/chromeos_switches.cc
index 1fbad801422030f7f92a2e7ab4813f1ed55f428d..15b31674579b7b0ba77e0fdc16ea9816b19f7347 100644
--- a/chromeos/chromeos_switches.cc
+++ b/chromeos/chromeos_switches.cc
@@ -145,6 +145,11 @@ const char kEnablePhysicalKeyboardAutocorrect[] =
 const char kDisablePhysicalKeyboardAutocorrect[] =
     "disable-physical-keyboard-autocorrect";
 
+// Shows additional checkboxes in Settings to enable Chrome OS accessibility
+// features that haven't launched yet.
+const char kEnableExperimentalAccessibilityFeatures[] =
+    "enable-experimental-accessibility-features";
+
 // Enabled sharing assets for installed default apps.
 const char kEnableExtensionAssetsSharing[]  = "enable-extension-assets-sharing";