Rewrite DocumentMarkerController to use SynchronousMutationObserver

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 42 matching lines @@
     case PaintInvalidationLayoutObjectRemoval:
       return "layoutObject removal";
     case PaintInvalidationSVGResourceChange:
       return "SVG resource change";
     case PaintInvalidationBackgroundOnScrollingContentsLayer:
       return "background on scrolling contents layer";
     case PaintInvalidationCaret:
       return "caret";
     case PaintInvalidationViewBackground:
       return "view background";
+    case PaintInvalidationDocumentMarkerChange:
+      return "DocumentMarker change";
     case PaintInvalidationForTesting:
       return "for testing";
     case PaintInvalidationDelayedFull:
       return "delayed full";
   }
   ASSERT_NOT_REACHED();
   return "";
 }
 
 }  // namespace blink