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

third_party/WebKit/Source/core/editing/Editor.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 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 1149 matching lines @@
 }
 
 template <typename Strategy>
 static PassRefPtrWillBeRawPtr<Range> findStringAndScrollToVisibleAlgorithm(Editor& editor, const String& target, const EphemeralRangeTemplate<Strategy>& previousMatch, FindOptions options)
 {
     RefPtrWillBeRawPtr<Range> nextMatch = editor.findRangeOfString(target, previousMatch, options);
     if (!nextMatch)
         return nullptr;
 
     nextMatch->firstNode()->layoutObject()->scrollRectToVisible(LayoutRect(nextMatch->boundingBox()),
-        ScrollAlignment::alignCenterIfNeeded, ScrollAlignment::alignCenterIfNeeded);
+        ScrollAlignment::alignCenterIfNeeded, ScrollAlignment::alignCenterIfNeeded, UserScroll);
 
     return nextMatch.release();
 }
 
 PassRefPtrWillBeRawPtr<Range> Editor::findStringAndScrollToVisible(const String& target, Range* range, FindOptions options)
 {
     if (RuntimeEnabledFeatures::selectionForComposedTreeEnabled())
         return findStringAndScrollToVisibleAlgorithm<EditingInComposedTreeStrategy>(*this, target, EphemeralRangeInComposedTree(range), options);
     return findStringAndScrollToVisibleAlgorithm<EditingStrategy>(*this, target, EphemeralRange(range), options);
 }
@@ skipping 120 matching lines @@
 }
 
 DEFINE_TRACE(Editor)
 {
     visitor->trace(m_frame);
     visitor->trace(m_lastEditCommand);
     visitor->trace(m_mark);
 }
 
 } // namespace blink