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

components/policy/core/common/cloud/component_cloud_policy_store.cc

 // 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.
 
 #include "components/policy/core/common/cloud/component_cloud_policy_store.h"
 
 #include "base/callback.h"
 #include "base/json/json_reader.h"
 #include "base/logging.h"
 #include "base/strings/string_util.h"
 #include "base/values.h"
 #include "components/policy/core/common/cloud/cloud_policy_constants.h"
 #include "components/policy/core/common/cloud/cloud_policy_validator.h"
 #include "components/policy/core/common/external_data_fetcher.h"
 #include "components/policy/core/common/policy_map.h"
+#include "components/policy/core/common/policy_types.h"
 #include "crypto/sha2.h"
 #include "policy/proto/chrome_extension_policy.pb.h"
 #include "policy/proto/device_management_backend.pb.h"
 #include "url/gurl.h"
 
 namespace em = enterprise_management;
 
 namespace policy {
 
 namespace {
@@ skipping 320 matching lines @@
     PolicyLevel level = POLICY_LEVEL_MANDATORY;
     std::string level_string;
     if (description->GetStringWithoutPathExpansion(kLevel, &level_string) &&
         level_string == kRecommended) {
       level = POLICY_LEVEL_RECOMMENDED;
     }
 
     // If policy for components is ever used for device-level settings then
     // this must support a configurable scope; assuming POLICY_SCOPE_USER is
     // fine for now.
-    policy->Set(it.key(), level, POLICY_SCOPE_USER, value.release(), NULL);
+    policy->Set(it.key(), level, POLICY_SCOPE_USER, POLICY_SOURCE_CLOUD,
+                value.release(), nullptr);
   }
 
   return true;
 }
 
 }  // namespace policy