WebMessaging: Send transferable ArrayBuffers by copy-and-neuter semantics

third_party/WebKit/LayoutTests/http/tests/serviceworker/postmessage.html

Index: third_party/WebKit/LayoutTests/http/tests/serviceworker/postmessage.html
diff --git a/third_party/WebKit/LayoutTests/http/tests/serviceworker/postmessage.html b/third_party/WebKit/LayoutTests/http/tests/serviceworker/postmessage.html
index 16b4df9a994679066899b9690004a01a0c7fed19..8fc9778b2a64bea4cde2ec3043b238291b513ec7 100644
--- a/third_party/WebKit/LayoutTests/http/tests/serviceworker/postmessage.html
+++ b/third_party/WebKit/LayoutTests/http/tests/serviceworker/postmessage.html
@@ -52,4 +52,90 @@ promise_test(t => {
         });
   }, 'postMessage to a ServiceWorker (and back via MessagePort)');
 
+promise_test(t => {
+    var script = 'resources/postmessage-transferables-worker.js';
+    var scope = 'resources/blank.html';
+    var sw = navigator.serviceWorker;
+
+    var message = 'Hello, world!';
+    var text_encoder = new TextEncoder;
+    var text_decoder = new TextDecoder;
+
+    return service_worker_unregister_and_register(t, script, scope)
+      .then(r => {
+          add_completion_callback(() => r.unregister());
+
+          var ab = text_encoder.encode(message);
+          assert_equals(ab.byteLength, message.length);
+          r.installing.postMessage(ab, [ab.buffer]);
+          assert_equals(text_decoder.decode(ab), '');
+          assert_equals(ab.byteLength, 0);
+
+          return new Promise(resolve => { sw.onmessage = resolve; });
+        })
+      .then(e => {
+          // Verify the integrity of the transferred array buffer.
+          assert_equals(e.data.content, message);
+          assert_equals(e.data.byteLength, message.length);
+          return new Promise(resolve => { sw.onmessage = resolve; });
+        })
+      .then(e => {
+          // Verify the integrity of the array buffer sent back from
+          // ServiceWorker via Client.postMessage.
+          assert_equals(text_decoder.decode(e.data), message);
+          assert_equals(e.data.byteLength, message.length);
+          return new Promise(resolve => { sw.onmessage = resolve; });
+        })
+      .then(e => {
+          // Verify that the array buffer on ServiceWorker is neutered.
+          assert_equals(e.data.content, '');
+          assert_equals(e.data.byteLength, 0);
+        });
+  }, 'postMessage a transferable ArrayBuffer between ServiceWorker and Client');
+
+promise_test(t => {
+    var script = 'resources/postmessage-transferables-worker.js';
+    var scope = 'resources/blank.html';
+    var message = 'Hello, world!';
+    var text_encoder = new TextEncoder;
+    var text_decoder = new TextDecoder;
+    var port;
+
+    return service_worker_unregister_and_register(t, script, scope)
+      .then(r => {
+          add_completion_callback(() => r.unregister());
+
+          var channel = new MessageChannel;
+          port = channel.port1;
+          r.installing.postMessage(undefined, [channel.port2]);
+
+          var ab = text_encoder.encode(message);
+          assert_equals(ab.byteLength, message.length);
+          port.postMessage(ab, [ab.buffer]);
+          assert_equals(text_decoder.decode(ab), '');
+          assert_equals(ab.byteLength, 0);
+
+          return new Promise(resolve => { port.onmessage = resolve; });
+        })
+      .then(e => {
+          // Verify the integrity of the transferred array buffer.
+          assert_equals(e.data.content, message);
+          assert_equals(e.data.byteLength, message.length);
+          return new Promise(resolve => { port.onmessage = resolve; });
+        })
+      .then(e => {
+          // Verify the integrity of the array buffer sent back from
+          // ServiceWorker via Client.postMessage.
+          assert_equals(text_decoder.decode(e.data), message);
+          assert_equals(e.data.byteLength, message.length);
+          return new Promise(resolve => { port.onmessage = resolve; });
+        })
+      .then(e => {
+          // Verify that the array buffer on ServiceWorker is neutered.
+          assert_equals(e.data.content, '');
+          assert_equals(e.data.byteLength, 0);
+        });
+  }, 'postMessage a transferable ArrayBuffer between ServiceWorker and Client' +
+     ' over MessagePort');
+
 </script>