Add ManagementMode enum and GetManagementMode().

components/policy/core/common/cloud/cloud_policy_constants.h

Index: components/policy/core/common/cloud/cloud_policy_constants.h
diff --git a/components/policy/core/common/cloud/cloud_policy_constants.h b/components/policy/core/common/cloud/cloud_policy_constants.h
index b9daee29f54da6a83cb661a7f92c52d0f9d33864..1ef1ed9f809a484e1d34dfededb1d605966cdbf1 100644
--- a/components/policy/core/common/cloud/cloud_policy_constants.h
+++ b/components/policy/core/common/cloud/cloud_policy_constants.h
@@ -9,6 +9,10 @@
 
 #include "components/policy/policy_export.h"
 
+namespace enterprise_management {
+class PolicyData;
+}
+
 namespace policy {
 
 // Constants related to the device management protocol.
@@ -127,6 +131,22 @@ enum DeviceMode {
 // http://crbug.com/248527
 POLICY_EXPORT const char* GetChromeUserPolicyType();
 
+// An enum that indicates if a device that has a local owner, is enterprise-
+// managed, or is consumer-managed. This is a copy of ManagementMode in
+// PolicyData. See device_management_backend.proto for the explanation of each
+// mode.
+enum ManagementMode {
+  MANAGEMENT_MODE_LOCAL_OWNER = 0,
+  MANAGEMENT_MODE_ENTERPRISE_MANAGED = 1,
+  MANAGEMENT_MODE_CONSUMER_MANAGED = 2,
+};
+
+// Returns the management mode of |policy_data|. You should use this function
+// instead of using |management_mode| in |policy_data| to handle legacy
+// |policy_data| that doesn't have |management_mode| set.
+POLICY_EXPORT ManagementMode GetManagementMode(
+    const enterprise_management::PolicyData& policy_data);
+
 }  // namespace policy
 
 #endif  // COMPONENTS_POLICY_CORE_COMMON_CLOUD_CLOUD_POLICY_CONSTANTS_H_