Add navigation controls to DevTools screencast view

Source/core/inspector/InspectorPageAgent.cpp

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 439 matching lines @@
 }
 
 void InspectorPageAgent::navigate(ErrorString*, const String& url)
 {
     UserGestureIndicator indicator(DefinitelyProcessingNewUserGesture);
     Frame* frame = m_page->mainFrame();
     FrameLoadRequest request(frame->document()->securityOrigin(), ResourceRequest(frame->document()->completeURL(url)));
     frame->loader()->load(request);
 }
 
+void InspectorPageAgent::getNavigationHistory(ErrorString*, int*, RefPtr<TypeBuilder::Array<TypeBuilder::Page::NavigationEntry> >&)
+{ }
+
+void InspectorPageAgent::navigateToHistoryEntry(ErrorString*, int)
+{ }
+
 static PassRefPtr<TypeBuilder::Page::Cookie> buildObjectForCookie(const Cookie& cookie)
 {
     return TypeBuilder::Page::Cookie::create()
         .setName(cookie.name)
         .setValue(cookie.value)
         .setDomain(cookie.domain)
         .setPath(cookie.path)
         .setExpires(cookie.expires)
         .setSize((cookie.name.length() + cookie.value.length()))
         .setHttpOnly(cookie.httpOnly)
@@ skipping 820 matching lines @@
 }
 
 void InspectorPageAgent::setShowViewportSizeOnResize(ErrorString*, bool show, const bool* showGrid)
 {
     m_state->setBoolean(PageAgentState::showSizeOnResize, show);
     m_state->setBoolean(PageAgentState::showGridOnResize, showGrid && *showGrid);
 }
 
 } // namespace WebCore