Navigation transitions: Added "addStyleSheetByURL" function to insert stylesheet links.

Source/web/WebLocalFrameImpl.cpp

 /*
  * Copyright (C) 2009 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 1266 matching lines @@
 
 void WebLocalFrameImpl::extendSelectionAndDelete(int before, int after)
 {
     if (WebPlugin* plugin = focusedPluginIfInputMethodSupported()) {
         plugin->extendSelectionAndDelete(before, after);
         return;
     }
     frame()->inputMethodController().extendSelectionAndDelete(before, after);
 }
 
+void WebLocalFrameImpl::addStyleSheetByURL(const WebString& url)
+{
+    RefPtr<Element> styleElement = frame()->document()->createElement(HTMLNames::linkTag, false);
+
+    styleElement->setAttribute(HTMLNames::typeAttr, "text/css");
+    styleElement->setAttribute(HTMLNames::relAttr, "stylesheet");
+    styleElement->setAttribute(HTMLNames::hrefAttr, url);
+
+    frame()->document()->head()->appendChild(styleElement.release(), IGNORE_EXCEPTION);
+}
+
 void WebLocalFrameImpl::setCaretVisible(bool visible)
 {
     frame()->selection().setCaretVisible(visible);
 }
 
 VisiblePosition WebLocalFrameImpl::visiblePositionForWindowPoint(const WebPoint& point)
 {
     FloatPoint unscaledPoint(point);
     unscaledPoint.scale(1 / view()->pageScaleFactor(), 1 / view()->pageScaleFactor());
 
@@ skipping 604 matching lines @@
 
 void WebLocalFrameImpl::invalidateAll() const
 {
     ASSERT(frame() && frame()->view());
     FrameView* view = frame()->view();
     view->invalidateRect(view->frameRect());
     invalidateScrollbar();
 }
 
 } // namespace blink