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..b4aff0b2988dc23acddcc8bd1e4b5eedec89e5b1 100644
--- a/components/policy/core/common/policy_types.h
+++ b/components/policy/core/common/policy_types.h
@@ -28,6 +28,25 @@ enum PolicyLevel {
   POLICY_LEVEL_MANDATORY,
 };
 
+// The source of a policy indicates where its value is originating from.
+enum PolicySource {
+  // If the policy was set by because session is an enterprise environment.

[bartfab (slow), 2015/09/16 15:58:41]

Nit: "by" whom?

[fhorschig, 2015/09/17 11:20:42]

Done.

+  POLICY_SOURCE_ENTERPRISE_DEFAULT,
+
+  // If the policy was set by Chrome to an unchangeable value (e.g. to enforce
+  // ash tray visibility in public sessions).
+  POLICY_SOURCE_BUILT_IN,
+
+  // If the policy was set by a platform source.
+  POLICY_SOURCE_PLATFORM,
+
+  // If 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_