[DevTools] Introduce Common.List used as a backend for list controls

third_party/WebKit/LayoutTests/http/tests/inspector-unit/list-model.js

+TestRunner.addResult('Test ListModel API.');
+
+var list = new UI.ListModel();
+list.addEventListener(UI.ListModel.Events.ItemsReplaced, event => {
+  var data = event.data;
+  var inserted = [];
+  for (var index = data.index; index < data.index + data.inserted; index++)
+    inserted.push(list.itemAtIndex(index));
+  TestRunner.addResult(`Replaced [${data.removed.join(', ')}] at index ${data.index} with [${inserted.join(', ')}]`);
+  var all = [];
+  for (var index = 0; index < list.length(); index++)
+    all.push(list.itemAtIndex(index));
+  TestRunner.addResult(`Resulting list: [${all.join(', ')}]`);
+  TestRunner.addResult('');
+});
+
+TestRunner.addResult('Adding 0, 1, 2');
+list.replaceAllItems([0, 1, 2]);
+
+TestRunner.addResult('Replacing 0 with 5, 6, 7');
+list.replaceItemsInRange(0, 1, [5, 6, 7]);
+
+TestRunner.addResult('Pushing 10');
+list.pushItem(10);
+
+TestRunner.addResult('Popping 10');
+list.popItem();
+
+TestRunner.addResult('Removing 2');
+list.removeItemAtIndex(4);
+
+TestRunner.addResult('Inserting 8');
+list.insertItemAtIndex(1, 8);
+
+TestRunner.addResult('Replacing with 0...20');
+list.replaceAllItems([0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19]);
+
+TestRunner.addResult('Replacing 7 with 27');
+list.replaceItemsInRange(7, 8, [27]);
+
+TestRunner.addResult('Replacing 18, 19 with 28, 29');
+list.replaceItemsInRange(18, 20, [28, 29]);
+
+TestRunner.addResult('Replacing 1, 2, 3 with [31-43]');
+list.replaceItemsInRange(1, 4, [31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43]);
+
+TestRunner.addResult('Replacing all but 29 with []');
+list.replaceItemsInRange(0, 29, []);
+
+TestRunner.completeTest();