Add basic profiling command.

app/build.gradle

@@ -110,5 +110,6 @@ apply from: 'gradle/integrationTest.gradle'
 apply from: 'gradle/jacoco.gradle'
 apply from: 'gradle/journeyTest.gradle'
 apply from: 'gradle/performanceTest.gradle'
+apply from: 'gradle/profiling.gradle'
 apply from: 'gradle/spotless.gradle'
 apply from: 'gradle/versionInfo.gradle'

app/gradle/profiling.gradle

@@ -0,0 +1,27 @@
+/*
+   Copyright 2017-2018 Charles Korn.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License 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.
+*/
+
+// Use this like this: ./gradlew profileApp --args='-f ./src/journeyTest/resources/simple-task-using-image/batect.yml --list-tasks'
+// Note that this is configured for OS X, for Linux change the agentpath argument below.
+task profileApp(type: JavaExec) {
+    dependsOn jar
+
+    classpath = sourceSets.main.runtimeClasspath
+    main = project.mainClassName
+
+    // To enable memory instrumentation, add 'alloceach=1' below.
+    jvmArgs = ["-agentpath:/Applications/YourKit-Java-Profiler-2018.04.app/Contents/Resources/bin/mac/libyjpagent.jnilib=tracing,monitors,onexit=snapshot,sessionname=batect,snapshot_name_format={sessionname}-{datetime}"]
+}