[SPv2] Don't paint invisible PaintLayers with transform animations.

third_party/WebKit/Source/core/paint/PaintLayerPainter.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/paint/PaintLayerPainter.h"
 
 #include "core/frame/LocalFrame.h"
 #include "core/layout/LayoutView.h"
 #include "core/paint/ClipPathClipper.h"
 #include "core/paint/FilterPainter.h"
@@ skipping 58 matching lines @@
   const LayoutObject& layoutObject = m_paintLayer.layoutObject();
   if (layoutObject.hasBackdropFilter())
     return false;
 
   if (RuntimeEnabledFeatures::slimmingPaintV2Enabled()) {
     if (layoutObject.styleRef().opacity())
       return false;
 
     const EffectPaintPropertyNode* effect =
         layoutObject.paintProperties()->effect();
-    const TransformPaintPropertyNode* transform =
-        layoutObject.paintProperties()->transform();
-    if ((effect && effect->requiresCompositingForAnimation()) ||
-        (transform && transform->requiresCompositingForAnimation())) {
+    if (effect && effect->requiresCompositingForAnimation()) {
       return false;
     }
   }
 
   // 0.0004f < 1/2048. With 10-bit color channels (only available on the
   // newest Macs; otherwise it's 8-bit), we see that an alpha of 1/2048 or
   // less leads to a color output of less than 0.5 in all channels, hence
   // not visible.
   static const float kMinimumVisibleOpacity = 0.0004f;
   if (m_paintLayer.paintsWithTransparency(paintingInfo.getGlobalPaintFlags())) {
@@ skipping 1112 matching lines @@
           context, layoutObject, PaintPhaseClippingMask))
     return;
 
   IntRect snappedClipRect = pixelSnappedIntRect(clipRect.rect());
   LayoutObjectDrawingRecorder drawingRecorder(
       context, layoutObject, PaintPhaseClippingMask, snappedClipRect);
   context.fillRect(snappedClipRect, Color::black);
 }
 
 }  // namespace blink