XCM ExportMessage benchmark support (#6923)

* XCM ExportMessage benchmark support

* include inner-xcm in ExportMessage benchmark

---------

Signed-off-by: acatangiu <adrian@parity.io>

polkadot/runtime/westend/src/lib.rs

@@ -1756,8 +1756,8 @@ sp_api::impl_runtime_apis! {
 			impl runtime_parachains::disputes::slashing::benchmarking::Config for Runtime {}
 
 			use xcm::latest::{
-				AssetId::*, Fungibility::*, Junction, Junctions::*, MultiAsset, MultiAssets,
-				MultiLocation, Response,
+				AssetId::*, Fungibility::*, InteriorMultiLocation, Junction, Junctions::*,
+				MultiAsset, MultiAssets, MultiLocation, NetworkId, Response,
 			};
 			use xcm_config::{Westmint, TokenLocation};
 
@@ -1833,6 +1833,12 @@ sp_api::impl_runtime_apis! {
 					// Westend doesn't support asset locking
 					Err(BenchmarkError::Skip)
 				}
+
+				fn export_message_origin_and_destination(
+				) -> Result<(MultiLocation, NetworkId, InteriorMultiLocation), BenchmarkError> {
+					// Westend doesn't support exporting messages
+					Err(BenchmarkError::Skip)
+				}
 			}
 
 			type XcmBalances = pallet_xcm_benchmarks::fungible::Pallet::<Runtime>;

polkadot/runtime/westend/src/weights/xcm/mod.rs

@@ -246,7 +246,7 @@ impl<RuntimeCall> XcmWeightInfo<RuntimeCall> for WestendXcmWeight<RuntimeCall> {
 		Weight::MAX
 	}
 	fn export_message(_: &NetworkId, _: &Junctions, _: &Xcm<()>) -> Weight {
-		// Westend does not currently support export message operations
+		// Westend relay should not support export message operations
 		Weight::MAX
 	}
 	fn lock_asset(_: &MultiAsset, _: &MultiLocation) -> Weight {