Created test page to be used for window.history.go() tests.

ios/testing/data/http_server_files/history_go.js

Index: ios/testing/data/http_server_files/history_go.js
diff --git a/ios/testing/data/http_server_files/history_go.js b/ios/testing/data/http_server_files/history_go.js
new file mode 100644
index 0000000000000000000000000000000000000000..ba7d97bb3abd09c09b3ed4e24fe95f285c4d871d
--- /dev/null
+++ b/ios/testing/data/http_server_files/history_go.js
@@ -0,0 +1,69 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+window.onload = function() {
+  window.addEventListener('popstate', onPopstate);
+  window.addEventListener('hashchange', onHashChange);
+  updateOnLoadText('OnLoadText');
+};
+
+var onPopstate = function(e) {
+  updatePopStateReceivedText(true);
+  updateStateObjectText(e.state);
+};
+
+var onHashChange = function(e) {
+  updateHashChangeReceivedText(true);
+}
+
+var updateOnLoadText = function(text) {
+  document.getElementById('onLoadDiv').innerHTML = text;
+}
+
+var updateNoOpText = function(text) {
+  document.getElementById('noOpDiv').innerHTML = text;
+}
+
+var updatePopStateReceivedText = function(received) {
+  var text = received ? 'PopStateReceived' : '';
+  document.getElementById('popStateReceivedDiv').innerHTML = text;
+}
+
+var updateStateObjectText = function(state) {
+  document.getElementById('stateObjectDiv').innerHTML = state;
+}
+
+var updateHashChangeReceivedText = function(received) {
+  var text = received ? 'HashChangeReceived' : '';
+  document.getElementById('hashChangeReceivedDiv').innerHTML = text;
+}
+
+var buttonWasTapped = function() {

[Eugene But (OOO till 7-30), 2016/12/09 23:02:16]

s/buttonWasTapped/onButtonTap ?

[Eugene But (OOO till 7-30), 2016/12/09 23:02:16]

Please add comments to all non-trivial functions

[kkhorimoto, 2016/12/13 00:29:10]

Done.

+  updateOnLoadText('');
+  updateNoOpText('');
+  updatePopStateReceivedText(false);
+  updateStateObjectText('');
+  updateHashChangeReceivedText(false);
+  setTimeout("updateNoOpText('NoOpText')", 1000);
+}
+
+var goNoParameter = function() {
+  buttonWasTapped();
+  window.history.go();
+}
+
+var goZero = function() {
+  buttonWasTapped();
+  window.history.go(0);
+}
+
+var go2 = function() {
+  buttonWasTapped();
+  window.history.go(2);
+}
+
+var goBack2 = function() {
+  buttonWasTapped();
+  window.history.go(-1);
+}