Added a PolicyDomainDescriptor.

chrome/browser/policy/policy_domain_descriptor.h

Index: chrome/browser/policy/policy_domain_descriptor.h
diff --git a/chrome/browser/policy/policy_domain_descriptor.h b/chrome/browser/policy/policy_domain_descriptor.h
new file mode 100644
index 0000000000000000000000000000000000000000..022dfe2678ab57989f311994876acc732eb0f105
--- /dev/null
+++ b/chrome/browser/policy/policy_domain_descriptor.h
@@ -0,0 +1,53 @@
+// Copyright (c) 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_BROWSER_POLICY_POLICY_DOMAIN_DESCRIPTOR_H_
+#define CHROME_BROWSER_POLICY_POLICY_DOMAIN_DESCRIPTOR_H_
+
+#include <map>
+#include <string>
+
+#include "base/basictypes.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "chrome/browser/policy/policy_service.h"
+
+namespace policy {
+
+class PolicyBundle;
+class PolicySchema;
+
+// For each policy domain, this class keeps the complete list of valid
+// components for that domain, and the PolicySchema for each component.
+class PolicyDomainDescriptor : public base::RefCounted<PolicyDomainDescriptor> {
+ public:
+  typedef std::map<std::string, const PolicySchema*> SchemaMap;
+
+  explicit PolicyDomainDescriptor(PolicyDomain domain);
+
+  PolicyDomain domain() const { return domain_; }
+  const SchemaMap& components() const { return schema_map_; }
+
+  // Sets the |schema| for |component_id|, overridding any previously set
+  // schema for that component.
+  void SetComponent(const std::string& component_id,

[bartfab (slow), 2013/05/21 12:10:56]

Nit: Maybe better |SetComponentSchema| or |AddComponent|? "Setting a component"
does not convey any meaning; "setting the schema for a component" or "adding a
component to the list" does.

[Joao da Silva, 2013/05/21 17:50:14]

Went for RegisterComponent(), I think that conveys more clearly what this is
about, and hopefully apeases you and Mattias :-)

+                    scoped_ptr<PolicySchema> schema);
+
+  // Removes all the policies in |bundle| that don't match this descriptor.
+  // Policies of domains other than |domain_| are ignored.
+  void FilterBundle(PolicyBundle* bundle) const;
+
+ private:
+  friend class base::RefCounted<PolicyDomainDescriptor>;
+  ~PolicyDomainDescriptor();
+
+  PolicyDomain domain_;
+  SchemaMap schema_map_;
+
+  DISALLOW_COPY_AND_ASSIGN(PolicyDomainDescriptor);
+};
+
+}  // namespace policy
+
+#endif  // CHROME_BROWSER_POLICY_POLICY_DOMAIN_DESCRIPTOR_H_