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

chrome/browser/chromeos/policy/device_local_account_policy_provider.cc

Index: chrome/browser/chromeos/policy/device_local_account_policy_provider.cc
diff --git a/chrome/browser/chromeos/policy/device_local_account_policy_provider.cc b/chrome/browser/chromeos/policy/device_local_account_policy_provider.cc
index ca40ec6395be301d49a17859bd5a98cda41f179d..aed27217077f7b31236a9b63e2ebdc4cb6e1fa5b 100644
--- a/chrome/browser/chromeos/policy/device_local_account_policy_provider.cc
+++ b/chrome/browser/chromeos/policy/device_local_account_policy_provider.cc
@@ -29,6 +29,8 @@ DeviceLocalAccountPolicyProvider::DeviceLocalAccountPolicyProvider(
       store_initialized_(false),
       waiting_for_policy_refresh_(false),
       weak_factory_(this) {
+  // As the account originates from cloud, all its policies are set there, too.
+  source_ = POLICY_SOURCE_CLOUD;
   service_->AddObserver(this);
   UpdateFromBroker();
 }
@@ -170,8 +172,12 @@ void DeviceLocalAccountPolicyProvider::UpdateFromBroker() {
          it != chrome_policy_overrides_->end();
          ++it) {
       const PolicyMap::Entry& entry = it->second;
-      chrome_policy.Set(
-          it->first, entry.level, entry.scope, entry.value->DeepCopy(), NULL);
+      chrome_policy.SetWithSource(it->first,
+                                  entry.level,
+                                  entry.scope,
+                                  entry.value->DeepCopy(),
+                                  NULL,
+                                  POLICY_SOURCE_PROGRAMMATIC);
     }
   }