Add interface versioning. Methods queryVersion and requireVersion.

mojo/public/js/validator.js

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 define("mojo/public/js/validator", [
   "mojo/public/js/codec",
 ], function(codec) {
 
   var validationError = {
     NONE: 'VALIDATION_ERROR_NONE',
@@ skipping 192 matching lines @@
 
     if (version == 0 && (expectsResponse || isResponse))
       return validationError.MESSAGE_HEADER_MISSING_REQUEST_ID;
 
     if (isResponse && expectsResponse)
       return validationError.MESSAGE_HEADER_INVALID_FLAGS;
 
     return validationError.NONE;
   };
 
+  Validator.prototype.validateMessageIsRequestWithoutResponse = function() {
+    if (this.message.isResponse() || this.message.expectsResponse()) {
+      return validationError.MESSAGE_HEADER_INVALID_FLAGS;
+    }
+    return validationError.NONE;
+  };
+
+  Validator.prototype.validateMessageIsRequestExpectingResponse = function() {
+    if (this.message.isResponse() || !this.message.expectsResponse()) {
+      return validationError.MESSAGE_HEADER_INVALID_FLAGS;
+    }
+    return validationError.NONE;
+  };
+
+  Validator.prototype.validateMessageIsResponse = function() {
+    if (this.message.expectsResponse() || !this.message.isResponse()) {
+      return validationError.MESSAGE_HEADER_INVALID_FLAGS;
+    }
+    return validationError.NONE;
+  };
+
   // Returns the message.buffer relative offset this pointer "points to",
   // NULL_MOJO_POINTER if the pointer represents a null, or JS null if the
   // pointer's value is not valid.
   Validator.prototype.decodePointer = function(offset) {
     var pointerValue = this.message.buffer.getUint64(offset);
     if (pointerValue === 0)
       return NULL_MOJO_POINTER;
     var bufferOffset = offset + pointerValue;
     return Number.isSafeInteger(bufferOffset) ? bufferOffset : null;
   };
@@ skipping 259 matching lines @@
         return err;
     }
     return validationError.NONE;
   };
 
   var exports = {};
   exports.validationError = validationError;
   exports.Validator = Validator;
   return exports;
 });