[Reland] Correct fixed-position recording for Slimming Paint

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 140 matching lines @@
 
     switch (type) {
         DEBUG_STRING_CASE(BeginFilter);
         DEBUG_STRING_CASE(EndFilter);
         DEBUG_STRING_CASE(BeginCompositing);
         DEBUG_STRING_CASE(EndCompositing);
         DEBUG_STRING_CASE(BeginTransform);
         DEBUG_STRING_CASE(EndTransform);
         DEBUG_STRING_CASE(BeginClipPath);
         DEBUG_STRING_CASE(EndClipPath);
+        DEBUG_STRING_CASE(BeginFixedPosition);
+        DEBUG_STRING_CASE(EndFixedPosition);
+        DEBUG_STRING_CASE(BeginFixedPositionContainer);
+        DEBUG_STRING_CASE(EndFixedPositionContainer);
         DEFAULT_CASE;
     }
 }
 
 WTF::String DisplayItem::asDebugString() const
 {
     WTF::StringBuilder stringBuilder;
     stringBuilder.append('{');
     dumpPropertiesAsDebugString(stringBuilder);
     stringBuilder.append('}');
@@ skipping 10 matching lines @@
     stringBuilder.append("\", type: \"");
     stringBuilder.append(typeAsDebugString(type()));
     stringBuilder.append('"');
     if (m_id.scopeContainer)
         stringBuilder.append(String::format(", scope: \"%p,%d\"", m_id.scopeContainer, m_id.scopeId));
 }
 
 #endif
 
 } // namespace blink