ActionFS cleanup

PiperOrigin-RevId: 196290095
diff --git a/src/main/java/com/google/devtools/build/lib/actions/ActionExecutionContext.java b/src/main/java/com/google/devtools/build/lib/actions/ActionExecutionContext.java
index 5f1e051..411475e 100644
--- a/src/main/java/com/google/devtools/build/lib/actions/ActionExecutionContext.java
+++ b/src/main/java/com/google/devtools/build/lib/actions/ActionExecutionContext.java
@@ -279,6 +279,10 @@
     return fileOutErr;
   }
 
+  public boolean hasActionFileSystem() {
+    return actionFileSystem != null;
+  }
+
   /**
    * Provides a mechanism for the action to request values from Skyframe while it discovers inputs.
    */