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

components/policy/core/common/policy_loader_mac.mm

 // Copyright (c) 2015 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.
 
 #include "components/policy/core/common/policy_loader_mac.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/callback.h"
 #include "base/files/file_path.h"
@@ skipping 68 matching lines @@
         preferences_->CopyAppValue(name, application_id_));
     if (!value.get())
       continue;
     policy_present = true;
     bool forced = preferences_->AppValueIsForced(name, application_id_);
     PolicyLevel level =
         forced ? POLICY_LEVEL_MANDATORY : POLICY_LEVEL_RECOMMENDED;
     // TODO(joaodasilva): figure the policy scope.
     scoped_ptr<base::Value> policy = PropertyToValue(value);
     if (policy) {
-      chrome_policy.Set(it.key(), level, POLICY_SCOPE_USER, policy.release(),
-                        NULL);
+      chrome_policy.Set(it.key(), level, POLICY_SCOPE_USER,
+                        POLICY_SOURCE_PLATFORM, policy.release(), nullptr);
     } else {
       status.Add(POLICY_LOAD_STATUS_PARSE_ERROR);
     }
   }
 
   if (!policy_present)
     status.Add(POLICY_LOAD_STATUS_NO_POLICY);
 
   // Load policy for the registered components.
   LoadPolicyForDomain(POLICY_DOMAIN_EXTENSIONS, "extensions", bundle.get());
@@ skipping 72 matching lines @@
         base::SysUTF8ToCFStringRef(it.key()));
     base::ScopedCFTypeRef<CFPropertyListRef> value(
         preferences_->CopyAppValue(pref_name, bundle_id));
     if (!value.get())
       continue;
     bool forced = preferences_->AppValueIsForced(pref_name, bundle_id);
     PolicyLevel level =
         forced ? POLICY_LEVEL_MANDATORY : POLICY_LEVEL_RECOMMENDED;
     scoped_ptr<base::Value> policy_value = PropertyToValue(value);
     if (policy_value) {
-      policy->Set(it.key(), level, POLICY_SCOPE_USER, policy_value.release(),
-                  NULL);
+      policy->Set(it.key(), level, POLICY_SCOPE_USER, POLICY_SOURCE_PLATFORM,
+                  policy_value.release(), nullptr);
     }
   }
 }
 
 void PolicyLoaderMac::OnFileUpdated(const base::FilePath& path, bool error) {
   if (!error)
     Reload(false);
 }
 
 }  // namespace policy