Force flattening for elements with non-initial value of opacity

third_party/WebKit/Source/core/paint/PaintLayer.h

 /*
  * Copyright (C) 2003, 2009, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Intel Corporation. All rights reserved.
  *
  * Portions are Copyright (C) 1998 Netscape Communications Corporation.
  *
  * Other contributors:
  *   Robert O'Callahan <roc+@cs.cmu.edu>
  *   David Baron <dbaron@fas.harvard.edu>
  *   Christian Biesinger <cbiesinger@web.de>
@@ skipping 385 matching lines @@
     // resulting transform has transform-origin baked in. If the layer does not have a transform,
     // returns the identity matrix.
     TransformationMatrix currentTransform() const;
     TransformationMatrix renderableTransform(GlobalPaintFlags) const;
 
     // Get the perspective transform, which is applied to transformed sublayers.
     // Returns true if the layer has a -webkit-perspective.
     // Note that this transform does not have the perspective-origin baked in.
     TransformationMatrix perspectiveTransform() const;
     FloatPoint perspectiveOrigin() const;
-    bool preserves3D() const { return layoutObject()->style()->transformStyle3D() == TransformStyle3DPreserve3D; }
+    bool preserves3D() const { return layoutObject()->style()->preserves3D(); }
     bool has3DTransform() const { return m_rareData && m_rareData->transform && !m_rareData->transform->isAffine(); }
 
     // FIXME: reflections should force transform-style to be flat in the style: https://bugs.webkit.org/show_bug.cgi?id=106959
-    bool shouldPreserve3D() const { return !layoutObject()->hasReflection() && layoutObject()->style()->transformStyle3D() == TransformStyle3DPreserve3D; }
+    bool shouldPreserve3D() const { return !layoutObject()->hasReflection() && layoutObject()->style()->preserves3D(); }
 
     void filterNeedsPaintInvalidation();
 
     // Returns |true| if any property that renders using filter operations is
     // used (including, but not limited to, 'filter').
     bool hasFilterInducingProperty() const { return layoutObject()->hasFilterInducingProperty(); }
 
     void* operator new(size_t);
     // Only safe to call from LayoutBoxModelObject::destroyLayer()
     void operator delete(void*);
@@ skipping 481 matching lines @@
 
 } // namespace blink
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 void showLayerTree(const blink::PaintLayer*);
 void showLayerTree(const blink::LayoutObject*);
 #endif
 
 #endif // Layer_h