[SPv2] Track paint offset 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 108 matching lines @@
 
 struct SameSizeAsLayoutObject : DisplayItemClient {
   virtual ~SameSizeAsLayoutObject() {}  // Allocate vtable pointer.
   void* pointers[5];
   Member<void*> members[1];
 #if ENABLE(ASSERT)
   unsigned m_debugBitfields : 2;
 #endif
   unsigned m_bitfields;
   unsigned m_bitfields2;
-  LayoutRect m_previousVisualRect;
+  LayoutRect m_visualRect;
+  LayoutPoint m_paintOffset;
 };
 
 static_assert(sizeof(LayoutObject) == sizeof(SameSizeAsLayoutObject),
               "LayoutObject should stay small");
 
 bool LayoutObject::s_affectsParentBlock = false;
 
 // The pointer to paint properties is implemented as a global hash map
 // temporarily, to avoid memory regression during the transition towards SPv2.
 typedef HashMap<const LayoutObject*, std::unique_ptr<ObjectPaintProperties>>
@@ skipping 3406 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