Add progress.js; calculate download percent complete value

examples/progress.js

@@ -0,0 +1,36 @@
+//
+//  progress.js
+//  examples
+//
+//  Created by David Rowe on 29 Jan 2015.
+//  Copyright 2015 High Fidelity, Inc.
+//
+//  This script displays a progress download indicator when downloads are in progress.
+//
+//  Distributed under the Apache License, Version 2.0.
+//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
+//
+
+(function () {
+
+    var progress = 100;  // %
+
+    function updateInfo(info) {
+        var i;
+
+        if (info.downloading.length + info.pending === 0) {
+            progress = 100;
+        } else {
+            progress = 0;
+            for (i = 0; i < info.downloading.length; i += 1) {
+                progress += info.downloading[i];
+            }
+            progress = progress / (info.downloading.length + info.pending);
+        }
+
+        print(progress.toFixed(0) + "%");
+    }
+
+    GlobalServices.downloadInfoChanged.connect(updateInfo);
+    GlobalServices.updateDownloadInfo();
+}());