Changed EPosition to an enum class and renamed its members

third_party/WebKit/Source/core/layout/compositing/CompositingRequirementsUpdater.cpp

 /*
  * Copyright (C) 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2014 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 172 matching lines @@
       subtreeReasons |= CompositingReasonIsolateCompositedDescendants;
     }
 
     // FIXME: This should move into
     // CompositingReasonFinder::potentialCompositingReasonsFromStyle, but theres
     // a poor interaction with LayoutTextControlSingleLine, which sets this
     // hasOverflowClip directly.
     if (layer->layoutObject()->hasClipRelatedProperty())
       subtreeReasons |= CompositingReasonClipsCompositingDescendants;
 
-    if (layer->layoutObject()->style()->position() == FixedPosition)
+    if (layer->layoutObject()->style()->position() == EPosition::kFixed)
       subtreeReasons |= CompositingReasonPositionFixedWithCompositedDescendants;
   }
 
   // A layer with preserve-3d or perspective only needs to be composited if
   // there are descendant layers that will be affected by the preserve-3d or
   // perspective.
   if (has3DTransformedDescendants) {
     subtreeReasons |= layer->potentialCompositingReasonsFromStyle() &
                       CompositingReasonCombo3DDescendants;
   }
@@ skipping 334 matching lines @@
     descendantHas3DTransform |=
         anyDescendantHas3DTransform || layer->has3DTransform();
   }
 
   // At this point we have finished collecting all reasons to composite this
   // layer.
   layer->setCompositingReasons(reasonsToComposite);
 }
 
 }  // namespace blink