Structured cloning: improve DataCloneError reporting.

LayoutTests/fast/events/message-port-clone.html

Index: LayoutTests/fast/events/message-port-clone.html
diff --git a/LayoutTests/fast/events/message-port-clone.html b/LayoutTests/fast/events/message-port-clone.html
index b738887c39dac0ee28e5e7149b694e40b1022833..8b3ef59fb57d9d4cbfcab9a09193e7d13efe8643 100644
--- a/LayoutTests/fast/events/message-port-clone.html
+++ b/LayoutTests/fast/events/message-port-clone.html
@@ -13,20 +13,36 @@ channel.port1.onmessage = channel.port2.onmessage = function(evt) {
 }
 
 // Posting port to itself should throw an exception.
-shouldThrow("channel.port1.postMessage('msg', [channel.port1])", '"DataCloneError: Failed to execute \'postMessage\' on \'MessagePort\': Item #0 in the array of ports contains the source port."');
+shouldThrow("channel.port1.postMessage('msg', [channel.port1])", '"DataCloneError: Failed to execute \'postMessage\' on \'MessagePort\': Port at index 0 contains the source port."');
 
 debug("Posting port to entangled pair neuters the port and does nothing else:");
 channel = new MessageChannel;
 var channel2 = new MessageChannel;
 channel.port1.postMessage("msg", [channel.port2]);
-shouldThrow("channel2.port1.postMessage('msg', [channel.port2])", '"DataCloneError: Failed to execute \'postMessage\' on \'MessagePort\': Item #0 in the array of ports is already neutered."');
+shouldThrow("channel2.port1.postMessage('msg', [channel.port2])", '"DataCloneError: Failed to execute \'postMessage\' on \'MessagePort\': Port at index 0 is already neutered."');
 
 channel = new MessageChannel;
 channel2 = new MessageChannel
 channel.port1.postMessage("msg", [channel2.port1]);
 
+debug("Posting a neutered ArrayBuffer should throw.");
+channel = new MessageChannel;
+var arrayBuffer = new ArrayBuffer(2);
+
+channel.port1.postMessage("msg", [arrayBuffer]);
+shouldThrow("channel.port1.postMessage(arrayBuffer, [])", '"DataCloneError: Failed to execute \'postMessage\' on \'MessagePort\': An ArrayBuffer is neutered and could not be cloned."');
+
+debug("Posting a neutered ArrayBufferView should throw.");
+channel = new MessageChannel;
+var uint16Array = new Uint16Array(10);
+
+shouldThrow("channel.port1.postMessage('msg', [uint16Array])", '"DataCloneError: Failed to execute \'postMessage\' on \'MessagePort\': Value at index 0 does not have a transferable type."');
+
+channel.port1.postMessage("msg", [uint16Array.buffer]);
+shouldThrow("channel.port1.postMessage(uint16Array, [])", '"DataCloneError: Failed to execute \'postMessage\' on \'MessagePort\': An ArrayBuffer is neutered and could not be cloned."');
+
 // Should not be able to post a cloned port.
-shouldThrow("channel.port1.postMessage('msg', [channel2.port1])", '"DataCloneError: Failed to execute \'postMessage\' on \'MessagePort\': Item #0 in the array of ports is already neutered."');
+shouldThrow("channel.port1.postMessage('msg', [channel2.port1])", '"DataCloneError: Failed to execute \'postMessage\' on \'MessagePort\': Port at index 0 is already neutered."');
 
 // Test posting messages to a port in cloned state.
 
@@ -90,6 +106,7 @@ function testPostClosePort()
         finishJSTest();
     }
 }
+
 </script>
 </body>
 </html>