Keep original pushState() method for use in JS overwrite

ios/web/web_state/js/resources/core.js

 // Copyright 2012 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.
 
 // This file adheres to closure-compiler conventions in order to enable
 // compilation with ADVANCED_OPTIMIZATIONS. In particular, members that are to
 // be accessed externally should be specified in this['style'] as opposed to
 // this.style because member identifiers are minified by default.
 // See http://goo.gl/FwOgy
 
@@ skipping 357 matching lines @@
       popstateEvent.state = JSON.parse(stateObject);
 
     // setTimeout() is used in order to return immediately. Otherwise the
     // dispatchEvent call waits for all event handlers to return, which could
     // cause a ReentryGuard failure.
     window.setTimeout(function() {
       window.dispatchEvent(popstateEvent);
     }, 0);
   };
 
-  // Keep the original replaceState() method. It's needed to update UIWebView's
-  // URL and window.history.state property during history navigations that don't
-  // cause a page load.
+  // Keep the original pushState() and replaceState() methods. It's needed to
+  // update the web view's URL and window.history.state property during history
+  // navigations that don't cause a page load.
+  var originalWindowHistoryPushState = window.history.pushState;
   var originalWindowHistoryReplaceState = window.history.replaceState;
   __gCrWeb['replaceWebViewURL'] = function(url, stateObject) {
     originalWindowHistoryReplaceState.call(history, stateObject, '', url);
   };
 
   // Intercept window.history methods to call back/forward natively.
   window.history.back = function() {
     invokeOnHost_({'command': 'window.history.back'});
   };
   window.history.forward = function() {
     invokeOnHost_({'command': 'window.history.forward'});
   };
   window.history.go = function(delta) {
     invokeOnHost_({'command': 'window.history.go', 'value': delta});
   };
   window.history.pushState = function(stateObject, pageTitle, pageUrl) {
     __gCrWeb.message.invokeOnHost(
         {'command': 'window.history.willChangeState'});
     // Calling stringify() on undefined causes a JSON parse error.
     var serializedState =
         typeof(stateObject) == 'undefined' ? '' :
             __gCrWeb.common.JSONStringify(stateObject);
     pageUrl = pageUrl || window.location.href;
-    originalWindowHistoryReplaceState.call(history, stateObject, '', pageUrl);
+    originalWindowHistoryPushState.call(history, stateObject, '', pageUrl);

[Eugene But (OOO till 7-30), 2016/01/04 20:52:30]

I think you want to pass pageTitle as well, otherwise WKWebView's title may be
incorrect. Same is probably true for |replaceState|.

[Jackie Quinn, 2016/01/04 21:16:58]

Done.

     invokeOnHost_({'command': 'window.history.didPushState',
                    'stateObject': serializedState,
                    'baseUrl': document.baseURI,
                    'pageUrl': pageUrl.toString()});
   };
   window.history.replaceState = function(stateObject, pageTitle, pageUrl) {
     __gCrWeb.message.invokeOnHost(
         {'command': 'window.history.willChangeState'});
 
     // Calling stringify() on undefined causes a JSON parse error.
@@ skipping 237 matching lines @@
 
    // Handle or wait for and handle document load completion, if applicable.
    if (__gCrWeb.core_dynamic.handleDocumentLoaded)
      __gCrWeb.core_dynamic.handleDocumentLoaded();
 
     return true;
   };
 
   __gCrWeb.core.documentInject();
 }());  // End of anonymous object