Add pass operation on handles.

mojo/android/javatests/src/org/chromium/mojo/HandleMock.java

Index: mojo/android/javatests/src/org/chromium/mojo/HandleMock.java
diff --git a/mojo/android/javatests/src/org/chromium/mojo/HandleMock.java b/mojo/android/javatests/src/org/chromium/mojo/HandleMock.java
index 82b0f45b6d5223df64737a64d45da2922a7b7077..0144dbbee8feb207e7a79b9106acaa43846bfb78 100644
--- a/mojo/android/javatests/src/org/chromium/mojo/HandleMock.java
+++ b/mojo/android/javatests/src/org/chromium/mojo/HandleMock.java
@@ -66,6 +66,14 @@ public class HandleMock implements UntypedHandle, MessagePipeHandle,
     }
 
     /**
+     * @see org.chromium.mojo.system.UntypedHandle#pass()
+     */
+    @Override
+    public HandleMock pass() {
+        return this;
+    }
+
+    /**
      * @see ConsumerHandle#discardData(int, DataPipe.ReadFlags)
      */
     @Override