Merge pull request #26 from vivek/JENKINS-41010

[JENKINS-41010] Expose StepContext from PlaceholderTask

src/main/java/org/jenkinsci/plugins/workflow/support/steps/ExecutorStepExecution.java

@@ -41,6 +41,7 @@
 import static java.util.logging.Level.*;
 import java.util.logging.Logger;
 import javax.annotation.CheckForNull;
+import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
 import jenkins.model.Jenkins;
 import jenkins.model.Jenkins.MasterComputer;
@@ -247,6 +248,15 @@ private Object readResolve() {
             return this;
         }
 
+        /**
+         * Gives {@link FlowNode}, waiting to be executed  in build {@link Queue}.
+         *
+         * @return FlowNode instance, could be null.
+         */
+        public @CheckForNull FlowNode getNode() throws IOException, InterruptedException {
+            return context.get(FlowNode.class);
+        }
+
         @Override public Queue.Executable createExecutable() throws IOException {
             return new PlaceholderExecutable();
         }