Convert editing/spelling/spelling-attribute-change.html with spellcheck_test

third_party/WebKit/LayoutTests/editing/spelling/script-tests/spelling-attribute-change.js

-description('Tests if the spellchecker behaves correctly when the spellcheck attribute '
-    + 'is being changed by the script.');
-
-jsTestIsAsync = true;
-if (window.testRunner)
-    testRunner.setMockSpellCheckerEnabled(true);
-
-var parent = document.createElement("div");
-document.body.appendChild(parent);
-var sel = document.getSelection();
-
-function testSpellCheckingEnabled(target, enabled)
-{
-    target.spellcheck = enabled;
-
-    if (target.tagName == "SPAN") {
-        target.appendChild(document.createTextNode("Hello,"));
-        sel.setBaseAndExtent(target, 6, target, 6);
-    } else if (target.tagName == "INPUT" || target.tagName == "TEXTAREA") {
-        target.focus();
-        document.execCommand("InsertText", false, "Hello,");
-    }
-
-    document.execCommand("InsertText", false, 'z');
-    document.execCommand("InsertText", false, 'z');
-    document.execCommand("InsertText", false, ' ');
-
-    window.target = target;
-    shouldBe("target.spellcheck", enabled ? "true" : "false");
-    if (window.internals)
-        shouldBecomeEqual("internals.hasSpellingMarker(document, 6, 2)", enabled ? "true" : "false", done);
-    else
-        done();
-}
-
-function createElement(tagName, spellcheck)
-{
-    var target = document.createElement(tagName);
-    if (tagName == "SPAN")
-        target.setAttribute("contentEditable", "true");
-    if (spellcheck)
-        target.setAttribute("spellcheck", spellcheck);
-    return target;
-}
-
-function testFor(tagName, spellCheckAttribueValues)
-{
-    var target = createElement(tagName, spellCheckAttribueValues.initialValue);
-    parent.appendChild(target);
-
-    testSpellCheckingEnabled(target, spellCheckAttribueValues.destinationValue);
-}
-
-var testElements = [
-    "SPAN",
-    "INPUT",
-    "TEXTAREA"
-];
-
-const spellcheckAttributeVariances = [
-   { initialValue: undefined, destinationValue: true },
-   { initialValue: undefined, destinationValue: false },
-   { initialValue: true, destinationValue: true },
-   { initialValue: true, destinationValue: false },
-   { initialValue: false, destinationValue: true },
-   { initialValue: false, destinationValue: false }
-];
-
-var iterator = 0;
-var currentElement = null;
-
-function done()
-{
-    if (!currentElement) {
-        currentElement = testElements.shift();
-        // All elements have been already taken.
-        if (!currentElement)
-            return finishJSTest();
-    }
-
-    if (iterator != spellcheckAttributeVariances.length)
-        setTimeout(testFor(currentElement, spellcheckAttributeVariances[iterator++]), 0);
-    else {
-        iterator = 0;
-        currentElement = null;
-        done();
-    }
-}
-done();
-
-var successfullyParsed = true;