[S.P.] Don't draw frames of animated images that are offscreen

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 "config.h"
 #include "platform/graphics/PaintInvalidationReason.h"
 
 #include "wtf/Assertions.h"
 
 namespace blink {
@@ skipping 28 matching lines @@
     case PaintInvalidationScroll:
         return "scroll";
     case PaintInvalidationSelection:
         return "selection";
     case PaintInvalidationLayer:
         return "layer";
     case PaintInvalidationRendererInsertion:
         return "renderer insertion";
     case PaintInvalidationRendererRemoval:
         return "renderer removal";
+    case PaintInvalidationDelayedFull:
+        return "delayed full";
     }
     ASSERT_NOT_REACHED();
     return "";
 }
 
 }