Add pass operation on handles.

mojo/public/java/src/org/chromium/mojo/system/MessagePipeHandle.java

Index: mojo/public/java/src/org/chromium/mojo/system/MessagePipeHandle.java
diff --git a/mojo/public/java/src/org/chromium/mojo/system/MessagePipeHandle.java b/mojo/public/java/src/org/chromium/mojo/system/MessagePipeHandle.java
index 086f6267df3a9983ce628d4b82ce3f0f7c9b5e42..cfb032756e93b91a6e57dce93f46f7e48365f83d 100644
--- a/mojo/public/java/src/org/chromium/mojo/system/MessagePipeHandle.java
+++ b/mojo/public/java/src/org/chromium/mojo/system/MessagePipeHandle.java
@@ -83,18 +83,6 @@ public interface MessagePipeHandle extends Handle {
     }
 
     /**
-     * Writes a message to the message pipe endpoint, with message data specified by |bytes| and
-     * attached handles specified by |handles|, and options specified by |flags|. If there is no
-     * message data, |bytes| may be null, otherwise it must be a direct ByteBuffer. If there are no
-     * attached handles, |handles| may be null.
-     * <p>
-     * If handles are attached, on success the handles will no longer be valid (the receiver will
-     * receive equivalent, but logically different, handles). Handles to be sent should not be in
-     * simultaneous use (e.g., on another thread).
-     */
-    void writeMessage(ByteBuffer bytes, List<? extends Handle> handles, WriteFlags flags);
-
-    /**
      * Result of the |readMessage| method.
      */
     public static class ReadMessageResult {
@@ -175,6 +163,24 @@ public interface MessagePipeHandle extends Handle {
     }
 
     /**
+     * @see org.chromium.mojo.system.Handle#pass()
+     */
+    @Override
+    public MessagePipeHandle pass();
+
+    /**
+     * Writes a message to the message pipe endpoint, with message data specified by |bytes| and
+     * attached handles specified by |handles|, and options specified by |flags|. If there is no
+     * message data, |bytes| may be null, otherwise it must be a direct ByteBuffer. If there are no
+     * attached handles, |handles| may be null.
+     * <p>
+     * If handles are attached, on success the handles will no longer be valid (the receiver will
+     * receive equivalent, but logically different, handles). Handles to be sent should not be in
+     * simultaneous use (e.g., on another thread).
+     */
+    void writeMessage(ByteBuffer bytes, List<? extends Handle> handles, WriteFlags flags);
+
+    /**
      * Reads a message from the message pipe endpoint; also usable to query the size of the next
      * message or discard the next message. |bytes| indicate the buffer/buffer size to receive the
      * message data (if any) and |maxNumberOfHandles| indicate the maximum handle count to receive