Check rect under-invalidations

third_party/WebKit/Source/platform/graphics/paint/DisplayItem.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/paint/DisplayItem.h"
 
 namespace blink {
 
 struct SameSizeAsDisplayItem {
     virtual ~SameSizeAsDisplayItem() { } // Allocate vtable pointer.
@@ skipping 54 matching lines @@
                 sb.append("Bottom");
             if (type & DisplayItem::TableCollapsedBorderLeft)
                 sb.append("Left");
             return sb.toString();
         }
     }
     switch (type) {
         DEBUG_STRING_CASE(BoxDecorationBackground);
         DEBUG_STRING_CASE(Caret);
         DEBUG_STRING_CASE(ColumnRules);
+        DEBUG_STRING_CASE(DebugDrawing);
         DEBUG_STRING_CASE(DebugRedFill);
         DEBUG_STRING_CASE(DocumentBackground);
         DEBUG_STRING_CASE(DragImage);
         DEBUG_STRING_CASE(SVGImage);
         DEBUG_STRING_CASE(LinkHighlight);
         DEBUG_STRING_CASE(ImageAreaFocusRing);
         DEBUG_STRING_CASE(PageOverlay);
         DEBUG_STRING_CASE(PageWidgetDelegateBackgroundFallback);
         DEBUG_STRING_CASE(PopupContainerBorder);
         DEBUG_STRING_CASE(PopupListBoxBackground);
@@ skipping 168 matching lines @@
     stringBuilder.append("\", type: \"");
     stringBuilder.append(typeAsDebugString(getType()));
     stringBuilder.append('"');
     if (m_skippedCache)
         stringBuilder.append(", skippedCache: true");
 }
 
 #endif
 
 } // namespace blink