Adding error handling to ONC validation.

chrome/app/chromeos_strings.grdp

 <?xml version="1.0" encoding="utf-8"?>
 <!-- ChromeOS-specific strings (included from generated_resources.grd).
      Everything in this file is wrapped in <if expr="pp_ifdef('chromeos')">. -->
 <grit-part>
   <!-- Idle Logout Dialog Strings -->
   <message name="IDS_IDLE_LOGOUT_TITLE" desc="Dialog title for the idle logout dialog">
     Are you still there?
   </message>
   <message name="IDS_IDLE_LOGOUT_WARNING_RESTART" desc="Restart label for the idle logout dialog">
     This computer will reset in <ph name="LOGOUT_TIME_LEFT">$1<ex>20</ex></ph> seconds.
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   </message>
   <message name="IDS_OFFERS_CONSENT_INFOBAR_ENABLE_BUTTON" desc="Enable button label.">
     Allow
   </message>
   <message name="IDS_OFFERS_CONSENT_INFOBAR_DISABLE_BUTTON" desc="Disable button label.">
     Deny
   </message>
   <message name="IDS_NETWORK_CONFIG_ERROR_NETWORK_NOT_A_JSON_DICTIONARY" desc="Error for network configuration: Configuration is not a valid JSON dictionary.">
     The configuration is not a valid JSON dictionary.
   </message>
+  <message name="IDS_NETWORK_CONFIG_ERROR_AT_TOPLEVEL" desc="Error for network configuration: The configuration contains an error at the top level.">
+    Error at the top level:
+  </message>
+  <message name="IDS_NETWORK_CONFIG_ERROR_AT_PATH" desc="Error for network configuration: A field/object in the configuration contains an error and the path of field names to this field/object is provided.">
+    Error at <ph name="PATH_TO_FIELD">$1<ex>WiFi.Security</ex></ph>:
+  </message>
+  <message name="IDS_NETWORK_CONFIG_WARNING_AT_TOPLEVEL" desc="Warning for network configuration: The configuration contains an warning at the top level.">
+    Warning at the top level:
+  </message>
+  <message name="IDS_NETWORK_CONFIG_WARNING_AT_PATH" desc="Warning for network configuration: A field/object in the configuration contains an warning and the path of field/object names to this field is provided.">
+    Warning at <ph name="PATH_TO_FIELD">$1<ex>WiFi.Security</ex></ph>:
+  </message>
+  <message name="IDS_NETWORK_CONFIG_ERROR_VALUE_HAS_WRONG_TYPE" desc="Error for network configuration: This field is assigned a value of a wrong type.">
+    Found value '<ph name="ACTUAL_VALUE">$1<ex>123</ex></ph>' of type <ph name="ACTUAL_TYPE">$2<ex>integer</ex></ph> but type <ph name="REQUIRED_TYPE">$3<ex>string</ex></ph> is required.
+  </message>
+  <message name="IDS_NETWORK_CONFIG_ERROR_UNKNOWN_FIELD_NAME" desc="Error for network configuration: The field name is unknown.">
+    Field name '<ph name="FIELD_NAME">$1<ex>secruity</ex></ph>' is unknown.
+  </message>
+  <message name="IDS_NETWORK_CONFIG_ERROR_UNEXPECTED_FIELD_IN_UNMANAGED_CONFIG" desc="Error for network configuration: Found a certain field that is not expected in unmanaged configurations.">
+    Found the field <ph name="UNEXPECTED_FIELD_NAME">$1<ex>Recommended</ex></ph> although this configuration is unmanaged.
+  </message>
+  <message name="IDS_NETWORK_CONFIG_ERROR_UNKNOWN_FIELD_RECOMMENDED" desc="Error for network configuration: An unknown field name is recommended in the configuration.">
+    The field '<ph name="UNEXPECTED_FIELD_NAME">$1<ex>passhprase</ex></ph>' cannot be recommended because it is unknown.
+  </message>
+  <message name="IDS_NETWORK_CONFIG_ERROR_INVALID_VALUE" desc="Error for network configuration: This field is assigned a value but none of the expected ones.">
+    Found value '<ph name="ACTUAL_VALUE">$1<ex>wlan</ex></ph>' but expected one of the values <ph name="EXPECTED_VALUES">$2<ex>[WiFi, Ethernet, Cellular]</ex></ph>.
+  </message>
+  <message name="IDS_NETWORK_CONFIG_ERROR_VALUE_OUT_OF_RANGE" desc="Error for network configuration: This field is assigned a value that is out of range (boundaries inclusive).">
+    Found value '<ph name="ACTUAL_VALUE">$1<ex>wlan</ex></ph>' but expected a value between <ph name="LOWER_BOUND">$2<ex>1</ex></ph> and <ph name="UPPER_BOUND">$3<ex>64</ex></ph>.
+  </message>
+  <message name="IDS_NETWORK_CONFIG_ERROR_REQUIRED_FIELD_MISSING" desc="Error for network configuration: A required field is missing.">
+    The required field '<ph name="MISSING_FIELD_NAME">$1<ex>Type</ex></ph>' is missing.
+  </message>
+  <message name="IDS_NETWORK_CONFIG_ERROR_NETWORKS_OR_CERTS_REQUIRED" desc="Error for network configuration: Either the network configurations or the certificates field has to be present.">
+    Neither the field '<ph name="NETWORKS_FIELD_NAME">$1<ex>NetworkConfigurations</ex></ph>' nor the field '<ph name="CERTIFICATES_FIELD_NAME">$1<ex>Certificates</ex></ph>' is present, but at least one is required.
+  </message>
+  <message name="IDS_NETWORK_CONFIG_ERROR_IGNORING_DEVICE_LEVEL_POLICY" desc="Error for network configuration: Certain types of networks cannot be configured in a device policy.">
+    Networks of this type cannot be configured in a device-level policy.
+  </message>
+  <message name="IDS_NETWORK_CONFIG_ERROR_NO_ACTIVE_ETHERNET" desc="Error for network configuration: Tried to configure an Ethernet network when there is no active Ethernet connection.">
+    Tried to configure an Ethernet network when there is no active Ethernet connection.
+  </message>
   <message name="IDS_NETWORK_CONFIG_LOADING_ERROR" desc="Error message for loading network configuration file.">
     Error loading network configuration file: <ph name="error">$1<ex>Unknown error</ex></ph>
   </message>
   <message name="IDS_NETWORK_CONFIG_ERROR_UNKNOWN" desc="Error for network configuration: Unknown error.">
     Unknown error
   </message>
   <message name="IDS_NETWORK_CONFIG_ERROR_INCORRECT_PASSWORD" desc="Error for network configuration: Incorrect password.">
     Incorrect password
   </message>
   <message name="IDS_NETWORK_CONFIG_ERROR_NETWORK_TYPE_MISSING" desc="Error for network configuration: Network type missing.">
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   <message name="IDS_LOGIN_MANAGED_BY_STATUS_NETWORK_ERROR" desc="Text for the network error status in 'Managed by DOMAIN' label on login screen.">
     Network error while communicating with the device management service.
   </message>
   <message name="IDS_LOGIN_MANAGED_BY_NOTICE" desc="Text for the notification bar on the login screen showing that this is a managed device.">
     This device is managed by <ph name="DOMAIN">$1<ex>yourdomain.com</ex></ph>.
   </message>
   <message name="IDS_LOGIN_MANAGED_REPORTING_HINT" desc="Text for the hint on reporting features displayed in the enterprise notification bar on the login screen.">
     Device usage may be tracked.
   </message>
 </grit-part>