Improve handling of PaintInvalidationLayer (renamed to PaintInvalidationSubtree)

third_party/WebKit/Source/platform/graphics/PaintInvalidationReason.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 "platform/graphics/PaintInvalidationReason.h"
 
 #include "wtf/Assertions.h"
 
 namespace blink {
 
@@ skipping 29 matching lines @@
     case PaintInvalidationBecameVisible:
         return "became visible";
     case PaintInvalidationBecameInvisible:
         return "became invisible";
     case PaintInvalidationScroll:
         return "scroll";
     case PaintInvalidationSelection:
         return "selection";
     case PaintInvalidationOutline:
         return "outline";
-    case PaintInvalidationLayer:
-        return "layer";
+    case PaintInvalidationSubtree:
+        return "subtree";
     case PaintInvalidationLayoutObjectInsertion:
         return "layoutObject insertion";
     case PaintInvalidationLayoutObjectRemoval:
         return "layoutObject removal";
     case PaintInvalidationSVGResourceChange:
         return "SVG resource change";
     case PaintInvalidationDelayedFull:
         return "delayed full";
     }
     ASSERT_NOT_REACHED();
     return "";
 }
 
 } // namespace blink