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..2b41047bbfc297eaa348735e4c5a875997b354b7 100644
--- a/components/policy/core/common/policy_types.h
+++ b/components/policy/core/common/policy_types.h
@@ -28,6 +28,28 @@ enum PolicyLevel {
   POLICY_LEVEL_MANDATORY,
 };
 
+// The source of a policy indicates where its value is originating from.
+enum PolicySource {
+  // The default value of a policy source.
+  POLICY_SOURCE_UNKNOWN,
+
+  // If the policy's default was determined by enterprise default settings.
+  POLICY_SOURCE_ENTERPRISE_DEFAULT,
+
+  // If the policy was programmatically set to an unchangeable value (e.g.
+  // to enforce ash tray visibility in public sessions).
+  POLICY_SOURCE_PROGRAMMATIC,
+
+  // If the policy is set by a platform source.
+  POLICY_SOURCE_PLATFORM,
+
+  // If the policy originates from 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_