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

chrome/browser/ui/webui/options/preferences_browsertest.cc

Index: chrome/browser/ui/webui/options/preferences_browsertest.cc
diff --git a/chrome/browser/ui/webui/options/preferences_browsertest.cc b/chrome/browser/ui/webui/options/preferences_browsertest.cc
index 2482e34424c4fef931eb41c0aa2e375756fdd804..2f2cee959ee51b77ee5ac91ffd7f71a63e78c9bb 100644
--- a/chrome/browser/ui/webui/options/preferences_browsertest.cc
+++ b/chrome/browser/ui/webui/options/preferences_browsertest.cc
@@ -201,7 +201,7 @@ void PreferencesBrowserTest::SetUserPolicies(
   policy::PolicyMap map;
   for (size_t i = 0; i < names.size(); ++i) {
     map.Set(names[i], level, policy::POLICY_SCOPE_USER,
-            values[i]->DeepCopy(), NULL);
+            policy::POLICY_SOURCE_CLOUD, values[i]->DeepCopy(), nullptr);
   }
   policy_provider_.UpdateChromePolicy(map);
 }
@@ -878,6 +878,7 @@ class ProxyPreferencesBrowserTest : public PreferencesBrowserTest {
     map.Set(policy_name,
             policy::POLICY_LEVEL_MANDATORY,
             scope,
+            policy::POLICY_SOURCE_CLOUD,
             new base::StringValue(onc_policy),
             NULL);
     policy_provider_.UpdateChromePolicy(map);