Add AWS REST XML protocol tests

settings.gradle.kts

@@ -1,6 +1,7 @@
 rootProject.name = "smithy"
 include(":smithy-aws-traits")
 include(":smithy-aws-apigateway-openapi")
+include(":smithy-aws-protocol-tests")
 include(":smithy-cli")
 include(":smithy-codegen-core")
 include(":smithy-codegen-freemarker")
@@ -13,3 +14,10 @@ include(":smithy-jsonschema")
 include(":smithy-openapi")
 include(":smithy-utils")
 include(":smithy-protocol-test-traits")
+
+pluginManagement {
+    repositories {
+        mavenLocal()
+        gradlePluginPortal()
+    }
+}

smithy-aws-protocol-tests/build.gradle.kts

@@ -0,0 +1,27 @@
+/*
+ * Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License").
+ * You may not use this file except in compliance with the License.
+ * A copy of the License is located at
+ *
+ *  http://aws.amazon.com/apache2.0
+ *
+ * or in the "license" file accompanying this file. This file is distributed
+ * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
+ * express or implied. See the License for the specific language governing
+ * permissions and limitations under the License.
+ */
+
+description = "Defines protocol tests for AWS HTTP protocols."
+extra["displayName"] = "Smithy :: AWS :: Protocol Tests"
+extra["moduleName"] = "software.amazon.smithy.aws.protocoltests"
+
+plugins {
+    id("software.amazon.smithy").version("0.4.2")
+}
+
+dependencies {
+    api(project(":smithy-protocol-test-traits"))
+    api(project(":smithy-aws-traits"))
+}