Use shim blob with importScripts to use CORS for Worker

lib/ace/worker/worker_client.js

@@ -57,7 +57,21 @@ var WorkerClient = function(topLevelNamespaces, mod, classname) {
         });
     }
 
-    this.$worker = new Worker(workerUrl);
+    try {
+        this.$worker = new Worker(workerUrl);
+    } catch ( e ) {
+        if ( e instanceof DOMException ) {
+            // Likely same origin problem. Use importScripts from a shim Worker
+            var blob = this.blobWorker(workerUrl),
+                URL = URL || webkitURL,
+                blobURL = URL.createObjectURL(blob);
+
+            this.$worker = new Worker(blobURL);
+            URL.revokeObjectURL(blobURL);
+        } else {
+            throw e;
+        }
+    }
     this.$worker.postMessage({
         init : true,
         tlns: tlns,
@@ -163,7 +177,24 @@ var WorkerClient = function(topLevelNamespaces, mod, classname) {
             this.call("setValue", [this.$doc.getValue()]);
         } else
             this.emit("change", {data: q});
-    }
+    };
+
+    this.blobWorker = function(workerUrl) {
+        var script = 'importScripts("' + workerUrl + '");',
+            blob;
+        try {
+            blob = new Blob(
+                [script],
+                { 'type' : 'application/javascript' }
+            );
+        } catch (e) { // Backwards-compatibility
+            var BlobBuilder = window.BlobBuilder || window.WebKitBlobBuilder || window.MozBlobBuilder,
+                blobBuilder = new BlobBuilder();
+            blobBuilder.append(script);
+            blob = blobBuilder.getBlob('application/javascript');
+        }
+        return blob;
+    };
 
 }).call(WorkerClient.prototype);