Update voronoi demo to use dictionary messages.

native_client_sdk/src/examples/demo/voronoi/example.js

 // Copyright (c) 2013 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.
 
 function moduleDidLoad() {
 }
 
 function postThreadFunc(numThreads) {
   return function () {
-    common.naclModule.postMessage('threads: ' + numThreads);
+    common.naclModule.postMessage({'message' : 'set_threads',
+                                   'value' : numThreads});
   }
 }
 
 // Add event listeners after the NaCl module has loaded.  These listeners will
 // forward messages to the NaCl module via postMessage()
 function attachListeners() {
   document.getElementById('benchmark').addEventListener('click',
     function() {
-      common.naclModule.postMessage('run benchmark');
+      common.naclModule.postMessage({'message' : 'run_benchmark'});
       common.updateStatus('BENCHMARKING... (please wait)');
     });
   document.getElementById('drawPoints').addEventListener('click',
     function() {
       var checked = document.getElementById('drawPoints').checked;
-      if (checked)
-        common.naclModule.postMessage('with points');
-      else
-        common.naclModule.postMessage('without points');
+      common.naclModule.postMessage({'message' : 'draw_points',
+                                     'value' : checked});
     });
   document.getElementById('drawInteriors').addEventListener('click',
     function() {
       var checked = document.getElementById('drawInteriors').checked;
-      if (checked)
-        common.naclModule.postMessage('with interiors');
-      else
-        common.naclModule.postMessage('without interiors');
+      common.naclModule.postMessage({'message' : 'draw_interiors',
+                                     'value' : checked});
     });
   var threads = [0, 1, 2, 4, 6, 8, 12, 16, 24, 32];
   for (var i = 0; i < threads.length; i++) {
-    document.getElementById('radio'+i).addEventListener('click',
+    document.getElementById('radio' + i).addEventListener('click',
         postThreadFunc(threads[i]));
   }
   document.getElementById('pointRange').addEventListener('change',
     function() {
-      var value = document.getElementById('pointRange').value;
-      common.naclModule.postMessage('points: ' + value);
+      var value = parseFloat(document.getElementById('pointRange').value);
+      common.naclModule.postMessage({'message' : 'set_points',
+                                     'value' : value});
       document.getElementById('pointCount').textContent = value + ' points';
     });
 }
 
 // Handle a message coming from the NaCl module.
 // In the Voronoi example, the only message will be the benchmark result.
 function handleMessage(message_event) {
-  var x = (Math.round(message_event.data * 1000) / 1000).toFixed(3);
-  document.getElementById('result').textContent =
-    'Result: ' + x + ' seconds';
-  common.updateStatus('SUCCESS')
+  if (message_event.data['message'] == 'benchmark_result') {
+    var x = (Math.round(message_event.data['value'] * 1000) / 1000).toFixed(3);
+    document.getElementById('result').textContent =
+      'Result: ' + x + ' seconds';
+    common.updateStatus('SUCCESS')
+  }
 }