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

chrome/browser/policy/policy_startup_browsertest.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Warning: this file will not be compiled for ChromeOS because the test
 // PolicyMakeDefaultBrowserTest is not valid for this platform.
 
 #include "base/command_line.h"
 #include "chrome/common/chrome_result_codes.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/test/base/in_process_browser_test.h"
 #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"
 
 class PolicyMakeDefaultBrowserTest : public InProcessBrowserTest {
  protected:
   PolicyMakeDefaultBrowserTest() : InProcessBrowserTest() {
     set_expected_exit_code(chrome::RESULT_CODE_ACTION_DISALLOWED_BY_POLICY);
   }
 
   void SetUpInProcessBrowserTestFixture() override {
     base::CommandLine::ForCurrentProcess()->AppendSwitch(
         switches::kMakeDefaultBrowser);
     EXPECT_CALL(provider_, IsInitializationComplete(testing::_))
                .WillRepeatedly(testing::Return(true));
 
     policy::BrowserPolicyConnector::SetPolicyProviderForTesting(&provider_);
 
     policy::PolicyMap values;
     values.Set(policy::key::kDefaultBrowserSettingEnabled,
                policy::POLICY_LEVEL_MANDATORY,
                policy::POLICY_SCOPE_MACHINE,
+               policy::POLICY_SOURCE_CLOUD,
                new base::FundamentalValue(false),
                NULL);
     provider_.UpdateChromePolicy(values);
   }
 
  private:
    policy::MockConfigurationPolicyProvider provider_;
    DISALLOW_COPY_AND_ASSIGN(PolicyMakeDefaultBrowserTest);
 };
 
 IN_PROC_BROWSER_TEST_F(PolicyMakeDefaultBrowserTest, MakeDefaultDisabled) {
 }