Use unions for interface control messages.

mojo/public/java/bindings/src/org/chromium/mojo/bindings/InterfaceControlMessagesHelper.java

Index: mojo/public/java/bindings/src/org/chromium/mojo/bindings/InterfaceControlMessagesHelper.java
diff --git a/mojo/public/java/bindings/src/org/chromium/mojo/bindings/InterfaceControlMessagesHelper.java b/mojo/public/java/bindings/src/org/chromium/mojo/bindings/InterfaceControlMessagesHelper.java
index 939fb93988a2df36618aa4a4de62e7ac8b6f6319..67f7497cdb045f80f01ef9a1b7ab3506db4630b8 100644
--- a/mojo/public/java/bindings/src/org/chromium/mojo/bindings/InterfaceControlMessagesHelper.java
+++ b/mojo/public/java/bindings/src/org/chromium/mojo/bindings/InterfaceControlMessagesHelper.java
@@ -64,11 +64,16 @@ public class InterfaceControlMessagesHelper {
      */
     public static <I extends Interface, P extends Proxy> boolean handleRun(
             Core core, Manager<I, P> manager, ServiceMessage message, MessageReceiver responder) {
+        Message payload = message.getPayload();
+        RunMessageParams query = RunMessageParams.deserialize(payload);
         RunResponseMessageParams response = new RunResponseMessageParams();
-        response.reserved0 = 16;
-        response.reserved1 = 0;
-        response.queryVersionResult = new QueryVersionResult();
-        response.queryVersionResult.version = manager.getVersion();
+        response.output = new RunOutput();
+        if (query.input.which() == RunInput.Tag.QueryVersion) {
+            response.output.setQueryVersionResult(new QueryVersionResult());
+            response.output.getQueryVersionResult().version = manager.getVersion();
+        } else {
+            return false;

[yzshen1, 2016/08/25 21:08:57]

We need to respond with a null output.

[Sam McNally, 2016/08/25 21:47:50]

Done.

+        }
 
         return responder.accept(response.serializeWithHeader(
                 core, new MessageHeader(InterfaceControlMessagesConstants.RUN_MESSAGE_ID,
@@ -84,6 +89,9 @@ public class InterfaceControlMessagesHelper {
             Manager<I, P> manager, ServiceMessage message) {
         Message payload = message.getPayload();
         RunOrClosePipeMessageParams query = RunOrClosePipeMessageParams.deserialize(payload);
-        return query.requireVersion.version <= manager.getVersion();
+        if (query.input.which() == RunOrClosePipeInput.Tag.RequireVersion) {
+            return query.input.getRequireVersion().version <= manager.getVersion();
+        }
+        return false;
     }
 }