Make contenteditable="false" element as atomic node for selection motion

LayoutTests/editing/selection/resources/js-test-selection-shared.js

+function $(id) { return document.getElementById(id); }
+
+var selection= window.getSelection();
+
+function testCaretMotion(direction, granularity, repeatCount, origin, originOffset, target, targetOffset) {
+  if (direction == 'both') {
+    testCaretMotion('forward', granularity, repeatCount, origin, originOffset, target, targetOffset);

[ojan, 2013/05/22 02:25:20]

Here and elsewhere, Blink style is 4-space indents.

[yosin_UTC9, 2013/05/22 07:54:12]

Done.

+    testCaretMotion('backward', granularity,repeatCount, target, targetOffset, origin, originOffset);
+    return;
+  }
+
+  if (typeof origin == 'string')
+    origin = $(origin);
+
+  if (typeof target == 'string')
+    target = $(target);
+
+  if (originOffset < 0)
+    originOffset = origin.firstChild.length + originOffset + 1;
+
+  if (targetOffset < 0)
+    targetOffset = target.firstChild.length + targetOffset + 1;
+
+  selection.setPosition(origin.firstChild, originOffset);
+  debug('Move ' + direction + ' ' + granularity + ' x ' + repeatCount);
+  for (var i = 0; i < repeatCount; ++i)
+    selection.modify("move", direction, granularity);
+  shouldEvaluateTo('selection.anchorNode', target.firstChild);
+  shouldEvaluateTo('selection.anchorOffset', targetOffset);
+}
+
 function objectAsString(object, properties) {
     var result = "[";
     for (var x = 0; x < properties.length; x++) {
         var property = properties[x];
         if (x != 0)
             result += " ";
 
         var value = object[property];
         if (value && value.nodeType) // textNode
             value = value + "(" + value.nodeValue + ")";
@@ skipping 28 matching lines @@
 }
 
 function clickAt(x, y) {
     if (window.eventSender) {
         eventSender.mouseMoveTo(x, y);
         eventSender.mouseDown();
         eventSender.mouseUp();
         return true;
     }
 }