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..f6b69216be281c598d4edee718495220cdfc5930 100644
--- a/chromeos/chromeos_switches.cc
+++ b/chromeos/chromeos_switches.cc
@@ -148,6 +148,9 @@ const char kDisablePhysicalKeyboardAutocorrect[] =
 // Enabled sharing assets for installed default apps.
 const char kEnableExtensionAssetsSharing[]  = "enable-extension-assets-sharing";
 
+const char kEnableExperimentalAccessibilityFeatures[] =
+    "enable-experimental-accessibility-features";
+
 // Enables notifications about captive portals in session.
 const char kEnableNetworkPortalNotification[] =
     "enable-network-portal-notification";