Mojom compiler: Port pack tests to the frontend.

mojom/mojom_parser/mojom/computed_data.go

Index: mojom/mojom_parser/mojom/computed_data.go
diff --git a/mojom/mojom_parser/mojom/computed_data.go b/mojom/mojom_parser/mojom/computed_data.go
index fc70091bb5de0c1e17b51c1700ee98df056fa274..615da1a94724c06ea6af5f66f805956b9b17c144 100644
--- a/mojom/mojom_parser/mojom/computed_data.go
+++ b/mojom/mojom_parser/mojom/computed_data.go
@@ -270,22 +270,10 @@ func computePayloadSizeSoFar(field *StructField) uint32 {
 func (i *MojomInterface) ComputeFinalData() error {
 	for _, method := range i.MethodsByOrdinal {
 		if method.Parameters != nil {
-			// Note(rudominer) computeFieldOffsets must be invoked before computeVersionInfo.
-			if err := (*method.Parameters).computeFieldOffsets(); err != nil {
-				return err
-			}
-			if err := (*method.Parameters).computeVersionInfo(); err != nil {
-				return err
-			}
+			return method.Parameters.ComputeFinalData()
 		}
 		if method.ResponseParameters != nil {
-			// Note(rudominer) computeFieldOffsets must be invoked before computeVersionInfo.
-			if err := (*method.ResponseParameters).computeFieldOffsets(); err != nil {
-				return err
-			}
-			if err := (*method.ResponseParameters).computeVersionInfo(); err != nil {
-				return err
-			}
+			return method.ResponseParameters.ComputeFinalData()
 		}
 	}
 	return nil