Scheduler, Whitelist: Add pov_mode attr

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

frame/scheduler/src/benchmarking.rs

@@ -160,6 +160,10 @@ benchmarks! {
 
 	// `service_task` when the task is a non-periodic, non-named, fetched call (with a known
 	// preimage length) and which is not dispatched (e.g. due to being overweight).
+	#[pov_mode = MaxEncodedLen {
+		// Use measured PoV size for the Preimages since we pass in a length witness.
+		Preimage::PreimageFor: Measured
+	}]
 	service_task_fetched {
 		let s in (BoundedInline::bound() as u32) .. (T::Preimages::MAX_LENGTH as u32);
 		let now = BLOCK_NUMBER.into();

frame/whitelist/src/benchmarking.rs

@@ -62,6 +62,10 @@ benchmarks! {
 	// We benchmark with the maximum possible size for a call.
 	// If the resulting weight is too big, maybe it worth having a weight which depends
 	// on the size of the call, with a new witness in parameter.
+	#[pov_mode = MaxEncodedLen {
+		// Use measured PoV size for the Preimages since we pass in a length witness.
+		Preimage::PreimageFor: Measured
+	}]
 	dispatch_whitelisted_call {
 		// NOTE: we remove `10` because we need some bytes to encode the variants and vec length
 		let n in 1 .. T::Preimages::MAX_LENGTH as u32 - 10;