[XHR] Accept data on didReceiveData call even if responseType is set to Blob

LayoutTests/http/tests/xmlhttprequest/resources/xmlhttprequest-response-type-blob.js

Index: LayoutTests/http/tests/xmlhttprequest/resources/xmlhttprequest-response-type-blob.js
diff --git a/LayoutTests/http/tests/xmlhttprequest/resources/xmlhttprequest-response-type-blob.js b/LayoutTests/http/tests/xmlhttprequest/resources/xmlhttprequest-response-type-blob.js
index 2a7b33fb64e6fd654f1b6d08c9a48727742067f4..d6e450a133fe85c62f97da5fa47aa8bb9c25b1f1 100644
--- a/LayoutTests/http/tests/xmlhttprequest/resources/xmlhttprequest-response-type-blob.js
+++ b/LayoutTests/http/tests/xmlhttprequest/resources/xmlhttprequest-response-type-blob.js
@@ -1,25 +1,88 @@
 var global = window;
 
-try {
+function readBlobAsArrayBuffer(blob) {
+    return new Promise(function (resolve, reject) {
+        var reader = new FileReader();
+        reader.onload = function (evt) {
+            resolve(evt.target.result);
+        };
+        reader.onabort = function (evt) {
+            reject(evt);
+        };
+        reader.onerror = function (evt) {
+            reject(evt);
+        };
+        reader.readAsText(blob, "utf-8");
+    });
+}
+
+new Promise(function (resolve, reject) {
     global.req = new XMLHttpRequest;
     req.responseType = "blob";
     req.open("GET", "resources/get.txt", true);
-    req.onreadystatechange = function() {
-        if (req.readyState == 4) {
-            shouldBe("req.status", "200");
-            shouldBe("req.response.size", "4");
-            var reader = new FileReader();
-            reader.onload = function (evt) {
-                global.buffer = evt.target.result;
-                shouldBeEqualToString("buffer", "PASS");
-                testPassed("XHR with responseType=\"blob\" succeeded");
-                finishJSTest();
-            };
-            reader.readAsText(req.response, "utf-8");
+    req.onreadystatechange = function () {
+        if (req.readyState != req.DONE) {
+            return;
         }
+
+        shouldBe("req.status", "200");
+        shouldBe("req.response.size", "4");
+        readBlobAsArrayBuffer(req.response).then(function (value) {
+            global.buffer = value;
+            shouldBeEqualToString("buffer", "PASS");
+            testPassed("Set responseType before open(): Successful");
+        }).then(resolve, reject);
     };
     req.send(null);
-} catch (e) {
-    testFailed("failed to create XMLHttpRequest with exception: " + e.message);
+}).catch(function (r) {
+    testFailed("Set responseType before open: Failed: " + r);
+}).then(function () {
+    return new Promise(function (resolve, reject)
+    {
+        global.req = new XMLHttpRequest;
+        req.open('GET', 'resources/get.txt', true);
+        req.onreadystatechange = function () {
+            if (req.readyState != req.DONE) {
+                return;
+            }
+
+            shouldBe("req.status", "200");
+            shouldBe("req.response.size", "4");
+            readBlobAsArrayBuffer(req.response).then(function (value) {
+                global.buffer = value;
+                shouldBeEqualToString("buffer", "PASS");
+                testPassed("Set responseType before send(): Successful");
+            }).then(resolve, reject);
+        };
+        req.responseType = 'blob';
+        req.send(null);
+    });
+}).catch(function (r) {
+    testFailed("Set responseType before send(): Failed: " + r);
+}).then(function () {
+    return new Promise(function (resolve, reject)
+    {
+        global.req = new XMLHttpRequest;
+        req.open('GET', 'resources/get.txt', true);
+        req.onreadystatechange = function () {
+            if (req.readyState == req.HEADERS_RECEIVED) {
+                req.responseType = 'blob';
+                return;
+            } else if (req.readyState != req.DONE) {
+                return;
+            }
+
+            shouldBe("req.status", "200");
+            shouldBe("req.response.size", "4");
+            readBlobAsArrayBuffer(req.response).then(function (value) {
+                global.buffer = value;
+                shouldBeEqualToString("buffer", "PASS");
+                testPassed("Set responseType in HEADERS_RECEIVED: Successful");
+            }).then(finishJSTest, reject);
+        };
+        req.send(null);
+    });
+}).catch(function (r) {
+    testFailed("Set responseType in HEADERS_RECEIVED: Failed: " + r);
     finishJSTest();
-}
+});