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

components/policy/core/common/policy_map.h

Index: components/policy/core/common/policy_map.h
diff --git a/components/policy/core/common/policy_map.h b/components/policy/core/common/policy_map.h
index 7d0d06b80b4ba35e13154726b2dabd17d7e86a43..8480e2ff20eb0a0cf2b2c3ef3fa12c1bee82e37e 100644
--- a/components/policy/core/common/policy_map.h
+++ b/components/policy/core/common/policy_map.h
@@ -28,6 +28,9 @@ class POLICY_EXPORT PolicyMap {
     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|.
@@ -58,14 +61,25 @@ class POLICY_EXPORT 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|.
+  // Sets the source of every Entry in the Map to the passed |source|.
+  void SetEntrySources(PolicySource source);
+
+  // Calls |SetWithSource| with default source.
   void Set(const std::string& policy,
            PolicyLevel level,
            PolicyScope scope,
            base::Value* value,
            ExternalDataFetcher* external_data_fetcher);
 
+  // Takes ownership of |value| and |external_data_fetcher|. Overwrites any
+  // existing information stored in the map for the key |policy|.
+  void SetWithSource(const std::string& policy,
+           PolicyLevel level,
+           PolicyScope scope,
+           base::Value* value,
+           ExternalDataFetcher* external_data_fetcher,
+           PolicySource source);
+
   // Erase the given |policy|, if it exists in this map.
   void Erase(const std::string& policy);