Add Ctrl+(+Shift)+Up/Down key bindings for Windows

LayoutTests/editing/input/ctrl-up-down.html

Index: LayoutTests/editing/input/ctrl-up-down.html
diff --git a/LayoutTests/editing/input/ctrl-up-down.html b/LayoutTests/editing/input/ctrl-up-down.html
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+++ b/LayoutTests/editing/input/ctrl-up-down.html
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+<div id="container">
+<p id="description"></p>
+Manual steps:
+<ol>
+<li>Move middle of the first paragraph</li>
+<li>Type Ctrl+Up</li>
+<li>Caret should be start of paragrah</li>
+<li>Type Ctrl+Down</li>
+<li>Caret should be next paragrah</li>
+<li>Do above step with Ctrl+Shift key to extend selection</li>
+</ol>
+Sample editable:
+<div id="sample" contenteditable="true"><p>This is the first paragraph. Key binding of Ctrl+Up/Down are available only Windows.</p><p>This is second paragraph. Do you want to have these key bindings on other platforms?</p>
+</div>
+</div>
+<script src="../../fast/js/resources/js-test-pre.js"></script>
+<script>
+description('Test Ctrl+Up/Down motion');
+function $(id) { return document.getElementById(id); }
+var sample = $('sample');
+var selection = window.getSelection();
+var range = document.createRange();
+range.setStart(sample.firstChild.firstChild, 3);
+selection.addRange(range);
+sample.focus();
+var paragraph1 = sample.firstChild.firstChild;
+var paragraph2 = sample.childNodes[1].firstChild;
+if (window.eventSender) {
+    eventSender.keyDown('upArrow', ['ctrlKey']);
+    shouldBeEqualToString('selection.type', 'Caret');
+    shouldBe('selection.focusNode', 'paragraph1');
+    shouldBe('selection.focusOffset', '0');
+
+    eventSender.keyDown('downArrow', ['ctrlKey']);
+    shouldBeEqualToString('selection.type', 'Caret');
+    shouldBe('selection.focusNode', 'paragraph2');
+    shouldBe('selection.focusOffset', '3');
+
+    eventSender.keyDown('downArrow', ['ctrlKey', 'shiftKey']);
+    shouldBeEqualToString('selection.type', 'Range');
+    shouldBe('selection.focusNode', 'paragraph2');
+    shouldBe('selection.focusOffset', '84');
+
+    eventSender.keyDown('upArrow', ['ctrlKey', 'shiftKey']);
+    shouldBeEqualToString('selection.type', 'Range');
+    shouldBe('selection.focusNode', 'paragraph1');
+    shouldBe('selection.focusOffset', '3');
+}
+if (window.testRunner)
+    $('container').outerHTML = '';
+</script>
+<script src="../../fast/js/resources/js-test-post.js"></script>