policy: use JSON schema to deserialize entries from Windows registry.

chrome/browser/policy/policy_domain_descriptor.cc

Index: chrome/browser/policy/policy_domain_descriptor.cc
diff --git a/chrome/browser/policy/policy_domain_descriptor.cc b/chrome/browser/policy/policy_domain_descriptor.cc
index 38327de95ab46fb0d41c022d036e336c64286b1b..cec7f4b81cb7dd8542dd84fba685a6d5e44c06b6 100644
--- a/chrome/browser/policy/policy_domain_descriptor.cc
+++ b/chrome/browser/policy/policy_domain_descriptor.cc
@@ -48,6 +48,14 @@ bool Matches(const PolicySchema* schema, const base::Value& value) {
 PolicyDomainDescriptor::PolicyDomainDescriptor(PolicyDomain domain)
     : domain_(domain) {}
 
+const PolicySchema* PolicyDomainDescriptor::get_schema(
+    const std::string& component) const {
+  SchemaMap::const_iterator iter = components().find(component);
+  if (iter != components().end())
+    return iter->second;
+  return NULL;
+}
+
 void PolicyDomainDescriptor::RegisterComponent(
     const std::string& component_id,
     scoped_ptr<PolicySchema> schema) {