Add policy management for on-screen keyboard.

chrome/browser/chromeos/policy/device_policy_decoder_chromeos.cc

Index: chrome/browser/chromeos/policy/device_policy_decoder_chromeos.cc
diff --git a/chrome/browser/chromeos/policy/device_policy_decoder_chromeos.cc b/chrome/browser/chromeos/policy/device_policy_decoder_chromeos.cc
index da02e02bb320c005773a83669149775910a4ab58..6f9e60657fa733f09786b31a6b5e108d6cfa05d4 100644
--- a/chrome/browser/chromeos/policy/device_policy_decoder_chromeos.cc
+++ b/chrome/browser/chromeos/policy/device_policy_decoder_chromeos.cc
@@ -551,6 +551,15 @@ void DecodeAccessibilityPolicies(const em::ChromeDeviceSettingsProto& policy,
               container.login_screen_default_screen_magnifier_type()),
           NULL);
     }
+    if (container.has_login_screen_default_virtual_keyboard_enabled()) {
+      policies->Set(
+          key::kDeviceLoginScreenDefaultVirtualKeyboardEnabled,
+          POLICY_LEVEL_MANDATORY,
+          POLICY_SCOPE_MACHINE,
+          base::Value::CreateBooleanValue(
+              container.login_screen_default_virtual_keyboard_enabled()),
+          NULL);
+    }
   }
 }