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

chrome/browser/chromeos/policy/device_policy_decoder_chromeos.cc

Index: chrome/browser/chromeos/policy/device_policy_decoder_chromeos.cc
diff --git a/chrome/browser/chromeos/policy/device_policy_decoder_chromeos.cc b/chrome/browser/chromeos/policy/device_policy_decoder_chromeos.cc
index 555d18bd44bf3c2f970828bc7cd1efce4c1f2d31..f1f8cb11a8e0f3e6116dceb1884c67ce8eabd9a3 100644
--- a/chrome/browser/chromeos/policy/device_policy_decoder_chromeos.cc
+++ b/chrome/browser/chromeos/policy/device_policy_decoder_chromeos.cc
@@ -740,8 +740,7 @@ void DecodeGenericPolicies(const em::ChromeDeviceSettingsProto& policy,
       policies->Set(
           key::kExtensionCacheSize, POLICY_LEVEL_MANDATORY,
           POLICY_SCOPE_MACHINE,
-          DecodeIntegerValue(container.extension_cache_size()).release(),
-          nullptr);
+          DecodeIntegerValue(container.extension_cache_size()).release(), NULL);

[Thiemo Nagel, 2015/09/01 17:40:36]

Don't convert code from nullptr to NULL (only the other way round).

[fhorschig, 2015/09/04 06:53:53]

Done. (FYI: These two calls of "policies->Set" are now again the only 2 of all
55 which use nullptr instead of NULL)

[Thiemo Nagel, 2015/09/04 20:15:53]

Feel free to submit a CL to convert the remaining 53.  Cf.
http://chromium-cpp.appspot.com/ and
https://groups.google.com/a/chromium.org/forum/#!topic/chromium-dev/4mijeJHzxLg.

     }
   }
 
@@ -752,7 +751,7 @@ void DecodeGenericPolicies(const em::ChromeDeviceSettingsProto& policy,
         key::kDeviceLoginScreenDomainAutoComplete, POLICY_LEVEL_MANDATORY,
         POLICY_SCOPE_MACHINE,
         new base::StringValue(container.login_screen_domain_auto_complete()),
-        nullptr);
+        NULL);
   }
 }