Sharing of SharedArrayBuffer via PostMessage transfer

LayoutTests/fast/workers/resources/worker-sharedarraybuffer-transfer.js

+function verifyArray(ta, length) {
+    for (i = 0; i < length; ++i) {
+        if (ta[i] != i) {
+            postMessage("FAIL: Transferred data is incorrect. Expected " +
+                i + " got " + ta[i]);
+            return;
+        }
+    }
+    postMessage("PASS: Transferred data is OK.");
+}
+
+function verifyArrayType(ta, name) {
+    var className = Object.prototype.toString.call(ta);
+    if (className.indexOf(name) != -1)
+        postMessage("PASS: Transferred array type is OK.");
+    else
+        postMessage("FAIL: Expected array type " + name + " got " + className);
+}
+
+self.addEventListener('message', function(e) {
+    var i;
+    var sab;
+    var ta;
+
+    switch (e.data.name) {
+        case 'SharedArrayBuffer':
+            sab = e.data.data;
+            ta = new Uint8Array(sab);
+            verifyArray(ta, e.data.length);
+            break;
+
+        case 'Int8Array':
+        case 'Uint8Array':
+        case 'Uint8ClampedArray':
+        case 'Int16Array':
+        case 'Uint16Array':
+        case 'Int32Array':
+        case 'Uint32Array':
+        case 'Float32Array':
+        case 'Float64Array':
+            ta = e.data.data;
+            verifyArrayType(ta, e.data.name);
+            verifyArray(ta, e.data.length);
+            break;
+
+        default:
+            postMessage("ERROR: unknown command " + e.data.name);
+            break;
+    }
+    postMessage("DONE");
+});