Blink-side contiguous allocation of display items.

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 {
 
 struct SameSizeAsDisplayItem {
@@ skipping 150 matching lines @@
 
     if (isTransform3DType(type))
         return transform3DTypeAsDebugString(type);
     if (isEndTransform3DType(type))
         return "End" + transform3DTypeAsDebugString(endTransform3DTypeToTransform3DType(type));
 
     PAINT_PHASE_BASED_DEBUG_STRINGS(SubtreeCached);
     PAINT_PHASE_BASED_DEBUG_STRINGS(BeginSubtree);
     PAINT_PHASE_BASED_DEBUG_STRINGS(EndSubtree);
 
+    if (type == UninitializedType)
+        return "UninitializedType";
+
     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);
@@ skipping 25 matching lines @@
     stringBuilder.append('"');
     if (m_skippedCache)
         stringBuilder.append(", skippedCache: true");
     if (m_scopeContainer)
         stringBuilder.append(String::format(", scope: \"%p,%d\"", m_scopeContainer, m_scopeId));
 }
 
 #endif
 
 } // namespace blink