ChromeOS: Add more host verification options for OpenVpn.

components/onc/onc_constants.cc

Index: components/onc/onc_constants.cc
diff --git a/components/onc/onc_constants.cc b/components/onc/onc_constants.cc
index 04df0b4c4cb54059726eaf0c1e879874b8e27d6f..5b65f69f6eb991fbfbdfc0e4855c625ff2c4bbba 100644
--- a/components/onc/onc_constants.cc
+++ b/components/onc/onc_constants.cc
@@ -265,8 +265,21 @@ const char kStaticChallenge[] = "StaticChallenge";
 const char kTLSAuthContents[] = "TLSAuthContents";
 const char kTLSRemote[] = "TLSRemote";
 const char kVerb[] = "Verb";
+const char kVerifyHash[] = "VerifyHash";
+const char kVerifyX509[] = "VerifyX509";
 }  // namespace openvpn
 
+namespace verify_x509 {
+const char kName[] = "Name";
+const char kType[] = "Type";
+
+namespace types {
+const char kName[] = "name";
+const char kNamePrefix[] = "name-prefix";
+const char kSubject[] = "subject";
+}  // namespace types
+}  // namespace verify_x509
+
 namespace proxy {
 const char kDirect[] = "Direct";
 const char kExcludeDomains[] = "ExcludeDomains";