Audit the use of updateStyleAndLayoutIgnorePendingStylesheets in SearchBuffer.

third_party/WebKit/Source/core/frame/LocalDOMWindow.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 839 matching lines @@
         UseCounter::count(frame()->document(), UseCounter::CrossOriginWindowPrompt);
 
     return String();
 }
 
 bool LocalDOMWindow::find(const String& string, bool caseSensitive, bool backwards, bool wrap, bool wholeWord, bool /*searchInFrames*/, bool /*showDialog*/) const
 {
     if (!isCurrentlyDisplayedInFrame())
         return false;
 
+    // Up-to-date, clean tree is required for finding text in page, since it relies
+    // on TextIterator to look over the text.
+    frame()->document()->updateStyleAndLayoutIgnorePendingStylesheets();
+
     // FIXME (13016): Support searchInFrames and showDialog
     FindOptions options = (backwards ? Backwards : 0) | (caseSensitive ? 0 : CaseInsensitive) | (wrap ? WrapAround : 0) | (wholeWord ? WholeWord | AtWordStarts : 0);
     return frame()->editor().findString(string, options);
 }
 
 bool LocalDOMWindow::offscreenBuffering() const
 {
     return true;
 }
 
@@ skipping 669 matching lines @@
 {
     // If the LocalDOMWindow still has a frame reference, that frame must point
     // back to this LocalDOMWindow: otherwise, it's easy to get into a situation
     // where script execution leaks between different LocalDOMWindows.
     if (m_frameObserver->frame())
         ASSERT_WITH_SECURITY_IMPLICATION(m_frameObserver->frame()->domWindow() == this);
     return m_frameObserver->frame();
 }
 
 } // namespace blink