Remove workaround for paint invalidation about percentage transform

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 453 matching lines @@
       // than necessary (when a layer is made of disjoint objects) but in
       // practice is a significant performance savings.
       layer()->addLayerHitTestRects(rects);
     }
   } else {
     LayoutObject::addLayerHitTestRects(rects, currentLayer, layerOffset,
                                        containerRect);
   }
 }
 
-static bool hasPercentageTransform(const ComputedStyle& style) {
-  if (TransformOperation* translate = style.translate()) {
-    if (translate->dependsOnBoxSize())
-      return true;
-  }
-  return style.transform().dependsOnBoxSize() ||
-         (style.transformOriginX() != Length(50, Percent) &&
-          style.transformOriginX().isPercentOrCalc()) ||
-         (style.transformOriginY() != Length(50, Percent) &&
-          style.transformOriginY().isPercentOrCalc());
-}
-
 DISABLE_CFI_PERF
 void LayoutBoxModelObject::invalidateTreeIfNeeded(
     const PaintInvalidationState& paintInvalidationState) {
   DCHECK(!RuntimeEnabledFeatures::slimmingPaintInvalidationEnabled());
   ensureIsReadyForPaintInvalidation();
 
   PaintInvalidationState newPaintInvalidationState(paintInvalidationState,
                                                    *this);
   if (!shouldCheckForPaintInvalidation(newPaintInvalidationState))
     return;
 
   if (mayNeedPaintInvalidationSubtree())
     newPaintInvalidationState
         .setForceSubtreeInvalidationCheckingWithinContainer();
 
   ObjectPaintInvalidator paintInvalidator(*this);
   LayoutRect previousVisualRect = this->previousVisualRect();
   LayoutPoint previousLocation = paintInvalidator.previousLocationInBacking();
   PaintInvalidationReason reason =
       invalidatePaintIfNeeded(newPaintInvalidationState);
   clearPaintInvalidationFlags();
 
   if (previousLocation != paintInvalidator.previousLocationInBacking()) {
     newPaintInvalidationState
         .setForceSubtreeInvalidationCheckingWithinContainer();
   }
 
-  // TODO(wangxianzhu): Combine this function into LayoutObject::
-  // invalidateTreeIfNeeded() when removing the following workarounds.
-
-  // TODO(wangxianzhu): This is a workaround for crbug.com/533277. Will remove
-  // when we enable paint offset caching.
-  if (reason != PaintInvalidationNone && hasPercentageTransform(styleRef())) {
-    newPaintInvalidationState
-        .setForceSubtreeInvalidationCheckingWithinContainer();
-  }
-
   // TODO(wangxianzhu): This is a workaround for crbug.com/490725. We don't have
   // enough saved information to do accurate check of clipping change. Will
   // remove when we remove rect-based paint invalidation.
   if (!RuntimeEnabledFeatures::slimmingPaintV2Enabled() &&
       previousVisualRect != this->previousVisualRect() &&
       !usesCompositedScrolling()
       // Note that isLayoutView() below becomes unnecessary after the launch of
       // root layer scrolling.
       && (hasOverflowClip() || isLayoutView())) {
     newPaintInvalidationState
@@ skipping 807 matching lines @@
   if (rootElementStyle->hasBackground())
     return false;
 
   if (node() != document().firstBodyElement())
     return false;
 
   return true;
 }
 
 }  // namespace blink