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

components/policy/core/common/policy_types.h

Index: components/policy/core/common/policy_types.h
diff --git a/components/policy/core/common/policy_types.h b/components/policy/core/common/policy_types.h
index 07289ca3ba04690360a82ab1752e3fa2ae86bb75..bfbb14d61ee6c8b08f06e4338708496b717c3988 100644
--- a/components/policy/core/common/policy_types.h
+++ b/components/policy/core/common/policy_types.h
@@ -28,6 +28,24 @@ enum PolicyLevel {
   POLICY_LEVEL_MANDATORY,
 };
 
+// The source of a policy indicates where its value is originating from.
+enum PolicySource {
+  // The policy was set because session is an enterprise environment.

[bartfab (slow), 2015/09/17 15:45:51]

Nit 1: s/because/because the/
Nit 2: It would be nice to avoid "session" here because the description will
then still make sense if we decide to use this source for a device policy at
some point.

[fhorschig, 2015/09/18 08:30:22]

Done.

+  POLICY_SOURCE_ENTERPRISE_DEFAULT,
+
+  // The policy was overridden because session is an enterprise environment.

[bartfab (slow), 2015/09/17 15:45:51]

Nit 1: s/because/because the/
Nit 2: It would be nice to avoid "session" here because the description will
then still make sense if we decide to use this source for a device policy at
some point.

[fhorschig, 2015/09/18 08:30:22]

Done.

+  POLICY_SOURCE_ENTERPRISE_OVERRIDE,
+
+  // The policy was set by a platform source.
+  POLICY_SOURCE_PLATFORM,
+
+  // The policy was set by a cloud source.
+  POLICY_SOURCE_CLOUD,
+
+  // Number of source types. Has to be the last element.
+  POLICY_SOURCE_COUNT
+};
+
 }  // namespace policy
 
 #endif  // COMPONENTS_POLICY_CORE_COMMON_POLICY_TYPES_H_