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

components/policy/core/common/config_dir_policy_loader_unittest.cc

Index: components/policy/core/common/config_dir_policy_loader_unittest.cc
diff --git a/components/policy/core/common/config_dir_policy_loader_unittest.cc b/components/policy/core/common/config_dir_policy_loader_unittest.cc
index 94b233d03c6c6782a1ef5abe0a51fa28250077fa..680621c1de610b7bea6bba7f2d110731814c5fe1 100644
--- a/components/policy/core/common/config_dir_policy_loader_unittest.cc
+++ b/components/policy/core/common/config_dir_policy_loader_unittest.cc
@@ -15,6 +15,7 @@
 #include "components/policy/core/common/configuration_policy_provider_test.h"
 #include "components/policy/core/common/policy_bundle.h"
 #include "components/policy/core/common/policy_map.h"
+#include "components/policy/core/common/policy_types.h"
 
 namespace policy {
 
@@ -68,7 +69,9 @@ class TestHarness : public PolicyProviderTestHarness {
 };
 
 TestHarness::TestHarness()
-    : PolicyProviderTestHarness(POLICY_LEVEL_MANDATORY, POLICY_SCOPE_MACHINE),
+    : PolicyProviderTestHarness(POLICY_LEVEL_MANDATORY,
+                                POLICY_SCOPE_MACHINE,
+                                POLICY_SOURCE_PLATFORM),
       next_policy_file_index_(100) {}
 
 TestHarness::~TestHarness() {}
@@ -225,7 +228,8 @@ TEST_F(ConfigDirPolicyLoaderTest, ReadPrefsMergePrefs) {
   ASSERT_TRUE(bundle.get());
   PolicyBundle expected_bundle;
   expected_bundle.Get(PolicyNamespace(POLICY_DOMAIN_CHROME, std::string()))
-      .LoadFrom(&test_dict_foo, POLICY_LEVEL_MANDATORY, POLICY_SCOPE_USER);
+      .LoadFrom(&test_dict_foo, POLICY_LEVEL_MANDATORY, POLICY_SCOPE_USER,
+                POLICY_SOURCE_PLATFORM);
   EXPECT_TRUE(bundle->Equals(expected_bundle));
 }