Skip paint property update and visual rect update if no geometry change

third_party/WebKit/Source/core/layout/LayoutObject.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2011 Apple Inc.
  *               All rights reserved.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved.
  *               (http://www.torchmobile.com/)
@@ skipping 3410 matching lines @@
 inline void LayoutObject::markAncestorsForPaintInvalidation() {
   for (LayoutObject* parent = this->paintInvalidationParent();
        parent && !parent->shouldCheckForPaintInvalidation();
        parent = parent->paintInvalidationParent())
     parent->m_bitfields.setMayNeedPaintInvalidation(true);
 }
 
 inline void LayoutObject::setNeedsPaintOffsetAndVisualRectUpdate() {
   if (needsPaintOffsetAndVisualRectUpdate())
     return;
+
   for (auto* object = this;
        object && !object->needsPaintOffsetAndVisualRectUpdate();
        object = object->paintInvalidationParent()) {
     object->m_bitfields.setNeedsPaintOffsetAndVisualRectUpdate(true);
 
     // Focus ring is special because continuations affect shape of focus ring.
     // Mark the start object for paint invalidation if it has focus ring.
     if (!object->isAnonymous() || !object->isLayoutBlockFlow())
       continue;
     auto* blockFlow = toLayoutBlockFlow(object);
@@ skipping 206 matching lines @@
     const blink::LayoutObject* root = object1;
     while (root->parent())
       root = root->parent();
     root->showLayoutTreeAndMark(object1, "*", object2, "-", 0);
   } else {
     WTFLogAlways("%s", "Cannot showLayoutTree. Root is (nil)");
   }
 }
 
 #endif