Throw DataCloneError on cloning closed Blobs/Files.

LayoutTests/fast/dom/Window/script-tests/postmessage-clone.js

 document.getElementById("description").innerHTML = "Tests that we clone object hierarchies";
 
 tryPostMessage('null');
 tryPostMessage('undefined');
 tryPostMessage('1');
 tryPostMessage('true');
 tryPostMessage('"1"');
 tryPostMessage('({})');
 tryPostMessage('({a:1})');
 tryPostMessage('({a:"a"})');
@@ skipping 57 matching lines @@
 var mutatedImageData = document.createElement("canvas").getContext("2d").createImageData(10,10);
 for (var i = 0; i < imageData.data.length * 4; i++)
     mutatedImageData.data[i] = i % 256;
 tryPostMessage('imageData', false, imageData);
 tryPostMessage('imageData.data', false, imageData.data)
 tryPostMessage('mutatedImageData', false, imageData);
 tryPostMessage('mutatedImageData.data', false, imageData.data)
 for (var i = 0; i < imageData.data.length * 4; i++)
     mutatedImageData.data[i] = 0;
 
+// Test close() special case for Blob (and File.)
+
+var blob = new Blob(["Hello"]);
+var blobSize = blob.size;
+tryPostMessage('blob', false, "evalThunk", function(v) { doPassFail(v.size === blobSize, "Cloned Blob size equal to the original size."); });
+tryPostMessage('blob.close(); blob', true, null, DOMException.DATA_CLONE_ERR);
+
+var constructedFile = new File(["Hello"], "test");
+var fileSize = constructedFile.size;
+tryPostMessage('constructedFile', false, "evalThunk", function(v) { doPassFail(v.size === fileSize, "Cloned File size equal to the original size."); });
+tryPostMessage('constructedFile.close(); constructedFile', true, null, DOMException.DATA_CLONE_ERR);
+
 function thunk(s) {
     return "(function() {" + s + "})()";
 }
 tryPostMessage(thunk('return 42;'), false, '42');
 tryPostMessage(thunk('return 42;'), false, thunk('return 40 + 2;'));
 tryPostMessage(thunk('return 42;'), false, "evalThunk",
                function(v) { doPassFail(v == 42, "evalThunk OK"); })
 
 // Only enumerable properties should be serialized.
 tryPostMessage(thunk('var o = {x:"hello"}; Object.defineProperty(o, "y", {value:"goodbye"}); return o;'), false, '({x:"hello"})');
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             doPassFail(v[0].length === window.fileList.length, "FileList length sent correctly");
             doPassFail(v[0][0] !== v[1], "FileList should not respect reference equality (0)");
             doPassFail(v[0][1] !== v[2], "FileList should not respect reference equality (1)");
             doPassFail(v[0][0].name == window.file0.name, "FileList preserves order and data (name0)");
             doPassFail(v[0][1].name == window.file1.name, "FileList preserves order and data (name1)");
             doPassFail(equal(v[0][0].lastModifiedDate, window.file0.lastModifiedDate), "FileList preserves order and data (date0)");
             doPassFail(equal(v[0][1].lastModifiedDate, window.file1.lastModifiedDate), "FileList preserves order and data (date1)");
         });
 }
 tryPostMessage('"done"');