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

remoting/host/policy_watcher_unittest.cc

Index: remoting/host/policy_watcher_unittest.cc
diff --git a/remoting/host/policy_watcher_unittest.cc b/remoting/host/policy_watcher_unittest.cc
index cf5ea3732f57766bedba0ffc02b22a76faac5972..729c2fd8bf71e5784d950e43b222923b0ca2d0e3 100644
--- a/remoting/host/policy_watcher_unittest.cc
+++ b/remoting/host/policy_watcher_unittest.cc
@@ -186,7 +186,8 @@ class PolicyWatcherTest : public testing::Test {
     policy::PolicyBundle policy_bundle;
     policy::PolicyMap& policy_map = policy_bundle.Get(policy_namespace);
     policy_map.LoadFrom(&dict, policy::POLICY_LEVEL_MANDATORY,
-                        policy::POLICY_SCOPE_MACHINE);
+                        policy::POLICY_SCOPE_MACHINE,
+                        policy::POLICY_SOURCE_CLOUD);
 
     // Simulate a policy file/registry/preference update.
     policy_loader_->SetPolicies(policy_bundle);