Emit dummy display item when recorded picture is empty

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 "config.h"
 #include "platform/graphics/paint/DisplayItem.h"
 
 namespace blink {
 
 #ifndef NDEBUG
@@ skipping 56 matching lines @@
 {
     WTF::StringBuilder stringBuilder;
     stringBuilder.append('{');
     dumpPropertiesAsDebugString(stringBuilder);
     stringBuilder.append('}');
     return stringBuilder.toString();
 }
 
 void DisplayItem::dumpPropertiesAsDebugString(WTF::StringBuilder& stringBuilder) const
 {
+    stringBuilder.append("name: \"");
+    stringBuilder.append(name());
+    stringBuilder.append("\", ");
     if (!clientDebugString().isEmpty()) {
         stringBuilder.append(clientDebugString());
         stringBuilder.append(", ");
     }
     stringBuilder.append("type: \"");
-    if (isCached())
-        stringBuilder.append("Cached-");
     stringBuilder.append(typeAsDebugString(type()));
     stringBuilder.append('"');
 }
 
 #endif
 
 } // namespace blink