Audit the use of updateStyleAndLayoutIgnorePendingStylesheets in SearchBuffer.

third_party/WebKit/Source/web/TextFinder.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 282 matching lines @@
 
     if (m_resumeScopingFromRange) {
         // This is a continuation of a scoping operation that timed out and didn't
         // complete last time around, so we should start from where we left off.
         DCHECK(m_resumeScopingFromRange->collapsed());
         searchStart = fromPositionInDOMTree<EditingInFlatTreeStrategy>(m_resumeScopingFromRange->endPosition());
         if (searchStart.document() != searchEnd.document())
             return;
     }
 
+    // TODO(dglazkov): The use of updateStyleAndLayoutIgnorePendingStylesheets needs to be audited.
+    // see http://crbug.com/590369 for more details.
+    searchStart.document()->updateStyleAndLayoutIgnorePendingStylesheets();

[dglazkov, 2016/07/13 22:40:11]

Goes up to WebLocalFrameImpl::scopeStringMatches and
to TextFinder::callScopeStringMatches, last one with a stern comment on how we
should not be flushing pipeline on a timeout.

+
     // This timeout controls how long we scope before releasing control. This
     // value does not prevent us from running for longer than this, but it is
     // periodically checked to see if we have exceeded our allocated time.
     const double maxScopingDuration = 0.1; // seconds
 
     int matchCount = 0;
     bool timedOut = false;
     double startTime = currentTime();
     do {
         // Find next occurrence of the search string.
@@ skipping 429 matching lines @@
 DEFINE_TRACE(TextFinder)
 {
     visitor->trace(m_ownerFrame);
     visitor->trace(m_activeMatch);
     visitor->trace(m_resumeScopingFromRange);
     visitor->trace(m_deferredScopingWork);
     visitor->trace(m_findMatchesCache);
 }
 
 } // namespace blink