Add chromium-side support for history.{push,replace}State.

chrome/renderer/render_thread.cc

 // Copyright (c) 2010 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.
 
 #include "chrome/renderer/render_thread.h"
 
 #include <v8.h>
 
 #include <algorithm>
 #include <limits>
@@ skipping 799 matching lines @@
       !command_line.HasSwitch(switches::kDisableSessionStorage));
 
   WebRuntimeFeatures::enableIndexedDatabase(
       command_line.HasSwitch(switches::kEnableIndexedDatabase));
 
   WebRuntimeFeatures::enableGeolocation(
       command_line.HasSwitch(switches::kEnableGeolocation));
 
   WebRuntimeFeatures::enableWebGL(
       command_line.HasSwitch(switches::kEnableExperimentalWebGL));
+
+  WebRuntimeFeatures::enablePushState(true);
 }
 
 void RenderThread::IdleHandler() {
 #if (defined(OS_WIN) || defined(OS_LINUX)) && defined(USE_TCMALLOC)
   MallocExtension::instance()->ReleaseFreeMemory();
 #endif
 
   LOG(INFO) << "RenderThread calling v8 IdleNotification for " << this;
   v8::V8::IdleNotification();
 
@@ skipping 95 matching lines @@
   spellchecker_->WordAdded(word);
 }
 
 void RenderThread::OnSpellCheckEnableAutoSpellCorrect(bool enable) {
   spellchecker_->EnableAutoSpellCorrect(enable);
 }
 
 void RenderThread::OnSetIsIncognitoProcess(bool is_incognito_process) {
   is_incognito_process_ = is_incognito_process;
 }