Adding a router class to handle messages that expect responses.

mojo/android/javatests/src/org/chromium/mojo/bindings/MessageTest.java

Index: mojo/android/javatests/src/org/chromium/mojo/bindings/MessageTest.java
diff --git a/mojo/android/javatests/src/org/chromium/mojo/bindings/MessageTest.java b/mojo/android/javatests/src/org/chromium/mojo/bindings/MessageTest.java
index 9f518f551f6084df8e63358ea0dd2fbe1fe8772a..6dc8a1a54b218e9eef028afe5082505b0f5bc477 100644
--- a/mojo/android/javatests/src/org/chromium/mojo/bindings/MessageTest.java
+++ b/mojo/android/javatests/src/org/chromium/mojo/bindings/MessageTest.java
@@ -72,11 +72,11 @@ public class MessageTest extends MojoTestCase {
         assertEquals(MojoResult.OK,
                 Message.readAndDispatchMessage(mHandles.second, mMessageReceiver));
         assertEquals(1, mMessageReceiver.messages.size());
-        Message message = mMessageReceiver.messages.get(0);
-        mHandlesToClose.addAll(message.handles);
-        assertEquals(mData, message.buffer);
-        assertEquals(2, message.handles.size());
-        for (Handle handle : message.handles) {
+        MessageWithHeader message = mMessageReceiver.messages.get(0);
+        mHandlesToClose.addAll(message.getMessage().handles);
+        assertEquals(mData, message.getMessage().buffer);
+        assertEquals(2, message.getMessage().handles.size());
+        for (Handle handle : message.getMessage().handles) {
             assertTrue(handle.isValid());
         }
     }