diff -r 000000000000 -r 6474c204b198 mobile/android/base/sync/CommandRunner.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mobile/android/base/sync/CommandRunner.java	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,22 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+package org.mozilla.gecko.sync;
+
+import java.util.List;
+
+public abstract class CommandRunner {
+  public final int argCount;
+
+  public CommandRunner(int argCount) {
+    this.argCount = argCount;
+  }
+
+  public abstract void executeCommand(GlobalSession session, List<String> args);
+
+  public boolean argumentsAreValid(List<String> args) {
+    return args != null &&
+           args.size() == argCount;
+  }
+}