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

chrome/browser/prefs/synced_pref_change_registrar_browsertest.cc

Index: chrome/browser/prefs/synced_pref_change_registrar_browsertest.cc
diff --git a/chrome/browser/prefs/synced_pref_change_registrar_browsertest.cc b/chrome/browser/prefs/synced_pref_change_registrar_browsertest.cc
index 29942bacdefa012ac0b44920a61fe43b9dfcf536..e84a6e5bdd1d29530fbbf797fb1e7bf09bc9d3da 100644
--- a/chrome/browser/prefs/synced_pref_change_registrar_browsertest.cc
+++ b/chrome/browser/prefs/synced_pref_change_registrar_browsertest.cc
@@ -29,6 +29,7 @@
 #include "components/policy/core/browser/browser_policy_connector.h"
 #include "components/policy/core/common/mock_configuration_policy_provider.h"
 #include "components/policy/core/common/policy_map.h"
+#include "components/policy/core/common/policy_types.h"
 #include "policy/policy_constants.h"
 #endif
 
@@ -191,6 +192,7 @@ IN_PROC_BROWSER_TEST_F(SyncedPrefChangeRegistrarTest,
   policies.Set(policy::key::kShowHomeButton,
                policy::POLICY_LEVEL_MANDATORY,
                policy::POLICY_SCOPE_USER,
+               policy::POLICY_SOURCE_CLOUD,
                new base::FundamentalValue(true),
                NULL);
   UpdateChromePolicy(policies);
@@ -212,6 +214,7 @@ IN_PROC_BROWSER_TEST_F(SyncedPrefChangeRegistrarTest,
   policies.Set(policy::key::kShowHomeButton,
                policy::POLICY_LEVEL_MANDATORY,
                policy::POLICY_SCOPE_USER,
+               policy::POLICY_SOURCE_CLOUD,
                new base::FundamentalValue(true),
                NULL);
   UpdateChromePolicy(policies);