LayoutBox::scrollRectToVisible doesn't respect overflow:hidden property.

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 618 matching lines @@
         // Make sure no node is focused. See http://crbug.com/38700.
         ownerFrame().frame()->document()->setFocusedElement(nullptr);
     }
 
     IntRect activeMatchRect;
     IntRect activeMatchBoundingBox = enclosingIntRect(LayoutObject::absoluteBoundingBoxRectForRange(m_activeMatch.get()));
 
     if (!activeMatchBoundingBox.isEmpty()) {
         if (m_activeMatch->firstNode() && m_activeMatch->firstNode()->layoutObject()) {
             m_activeMatch->firstNode()->layoutObject()->scrollRectToVisible(
-                LayoutRect(activeMatchBoundingBox), ScrollAlignment::alignCenterIfNeeded, ScrollAlignment::alignCenterIfNeeded);
+                LayoutRect(activeMatchBoundingBox), ScrollAlignment::alignCenterIfNeeded, ScrollAlignment::alignCenterIfNeeded, UserScroll);
         }
 
         // Zoom to the active match.
         activeMatchRect = ownerFrame().frameView()->contentsToRootFrame(activeMatchBoundingBox);
         ownerFrame().viewImpl()->zoomToFindInPageRect(activeMatchRect);
     }
 
     if (selectionRect)
         *selectionRect = activeMatchRect;
 
@@ skipping 152 matching lines @@
     visitor->trace(m_ownerFrame);
     visitor->trace(m_currentActiveMatchFrame);
     visitor->trace(m_activeMatch);
     visitor->trace(m_resumeScopingFromRange);
     visitor->trace(m_deferredScopingWork);
     visitor->trace(m_findMatchesCache);
 #endif
 }
 
 } // namespace blink