Remove ForceHorriblySlowRectMapping

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

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
  *           (C) 2005, 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 347 matching lines @@
 
 void LayoutBoxModelObject::invalidateTreeIfNeeded(const PaintInvalidationState& paintInvalidationState)
 {
     ASSERT(!needsLayout());
 
     PaintInvalidationState newPaintInvalidationState(paintInvalidationState, *this);
     if (!shouldCheckForPaintInvalidation(newPaintInvalidationState))
         return;
 
     LayoutRect previousPaintInvalidationRect = this->previousPaintInvalidationRect();
-
-    // TODO(wangxianzhu): Enable this assert after we fix all paintInvalidationContainer mismatch issues. crbug.com/360286
-    // ASSERT(&newPaintInvalidationState.paintInvalidationContainer() == &containerForPaintInvalidation());

[Xianzhu, 2016/03/29 23:05:24]

It's enough to check this in LayoutObject::invalidatePaintIfNeeded().

-
     PaintInvalidationReason reason = invalidatePaintIfNeeded(newPaintInvalidationState);
     clearPaintInvalidationFlags(newPaintInvalidationState);
 
     if (reason == PaintInvalidationDelayedFull)
         paintInvalidationState.pushDelayedPaintInvalidationTarget(*this);
 
     if (reason == PaintInvalidationLocationChange)
         newPaintInvalidationState.setForceSubtreeInvalidationWithinContainer();
 
     // TODO(wangxianzhu): Combine this function into LayoutObject::invalidateTreeIfNeeded() when removing the following workarounds.
@@ skipping 585 matching lines @@
     if (rootElementStyle->hasBackground())
         return false;
 
     if (node() != document().firstBodyElement())
         return false;
 
     return true;
 }
 
 } // namespace blink