AdGroupAssetOperation

A single operation (create, update, remove) on an ad group asset.

Fields
update_mask	FieldMask FieldMask that determines which resource fields are modified in an update.
Union field operation operation. The mutate operation. operation can be only one of the following:
create	AdGroupAsset Create operation: No resource name is expected for the new ad group asset.
update	AdGroupAsset Update operation: The ad group asset is expected to have a valid resource name.
remove	string Remove operation: A resource name for the removed ad group asset is expected, in this format: customers/{customer_id}/adGroupAssets/{ad_group_id}~{asset_id}~{field_type}