Add source column to chrome://policy showing the origins of policies.

components/policy/core/common/policy_map.h

 // Copyright 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 COMPONENTS_POLICY_CORE_COMMON_POLICY_MAP_H_
 #define COMPONENTS_POLICY_CORE_COMMON_POLICY_MAP_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 10 matching lines @@
 class POLICY_EXPORT PolicyMap {
  public:
   // Each policy maps to an Entry which keeps the policy value as well as other
   // relevant data about the policy.
   struct POLICY_EXPORT Entry {
     PolicyLevel level;
     PolicyScope scope;
     base::Value* value;
     ExternalDataFetcher* external_data_fetcher;
 
+    // For debugging and displaying only. Set by provider delivering the policy.
+    PolicySource source;
+
     Entry();
 
     // Deletes all members owned by |this|.
     void DeleteOwnedMembers();
 
     // Returns a copy of |this|.
     scoped_ptr<Entry> DeepCopy() const;
 
     // Returns true if |this| has higher priority than |other|.
     bool has_higher_priority_than(const Entry& other) const;
@@ skipping 15 matching lines @@
   // Returns a weak reference to the value currently stored for key |policy|,
   // or NULL if not found. Ownership is retained by the PolicyMap.
   // This is equivalent to Get(policy)->value, when it doesn't return NULL.
   const base::Value* GetValue(const std::string& policy) const;
 
   // Takes ownership of |value| and |external_data_fetcher|. Overwrites any
   // existing information stored in the map for the key |policy|.
   void Set(const std::string& policy,
            PolicyLevel level,
            PolicyScope scope,
+           PolicySource source,
            base::Value* value,
            ExternalDataFetcher* external_data_fetcher);
 
   // Erase the given |policy|, if it exists in this map.
   void Erase(const std::string& policy);
 
   // Swaps the internal representation of |this| with |other|.
   void Swap(PolicyMap* other);
 
   // |this| becomes a copy of |other|. Any existing policies are dropped.
   void CopyFrom(const PolicyMap& other);
 
   // Returns a copy of |this|.
   scoped_ptr<PolicyMap> DeepCopy() const;
 
   // Merges policies from |other| into |this|. Existing policies are only
   // overridden by those in |other| if they have a higher priority, as defined
   // by Entry::has_higher_priority_than(). If a policy is contained in both
   // maps with the same priority, the current value in |this| is preserved.
   void MergeFrom(const PolicyMap& other);
 
   // Loads the values in |policies| into this PolicyMap. All policies loaded
-  // will have |level| and |scope| in their entries. Existing entries are
-  // replaced.
+  // will have |level|, |scope| and |source| in their entries. Existing entries
+  // are replaced.
   void LoadFrom(const base::DictionaryValue* policies,
                 PolicyLevel level,
-                PolicyScope scope);
+                PolicyScope scope,
+                PolicySource source);
 
   // Compares this value map against |other| and stores all key names that have
   // different values or reference different external data in |differing_keys|.
   // This includes keys that are present only in one of the maps.
   // |differing_keys| is not cleared before the keys are added.
   void GetDifferingKeys(const PolicyMap& other,
                         std::set<std::string>* differing_keys) const;
 
   // Removes all policies that don't have the specified |level|. This is a
   // temporary helper method, until mandatory and recommended levels are served
@@ skipping 15 matching lines @@
                              const PolicyMapType::value_type& b);
 
   PolicyMapType map_;
 
   DISALLOW_COPY_AND_ASSIGN(PolicyMap);
 };
 
 }  // namespace policy
 
 #endif  // COMPONENTS_POLICY_CORE_COMMON_POLICY_MAP_H_