Simplify subtree (now subsequence) caching

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 162 matching lines @@
 
     PAINT_PHASE_BASED_DEBUG_STRINGS(Scroll);
     if (isEndScrollType(type))
         return "End" + typeAsDebugString(endScrollTypeToScrollType(type));
 
     if (isTransform3DType(type))
         return transform3DTypeAsDebugString(type);
     if (isEndTransform3DType(type))
         return "End" + transform3DTypeAsDebugString(endTransform3DTypeToTransform3DType(type));
 
-    PAINT_PHASE_BASED_DEBUG_STRINGS(CachedSubtree);
-    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);
         DEBUG_STRING_CASE(EndFixedPosition);
         DEBUG_STRING_CASE(BeginFixedPositionContainer);
         DEBUG_STRING_CASE(EndFixedPositionContainer);
+        DEBUG_STRING_CASE(BeginSubsequence);
+        DEBUG_STRING_CASE(EndSubsequence);
+        DEBUG_STRING_CASE(CachedSubsequence);
+        DEBUG_STRING_CASE(UninitializedType);
         DEFAULT_CASE;
     }
 }
 
 WTF::String DisplayItem::asDebugString() const
 {
     if (!isValid())
         return "null";
     WTF::StringBuilder stringBuilder;
     stringBuilder.append('{');
@@ skipping 15 matching lines @@
     stringBuilder.append('"');
     if (m_skippedCache)
         stringBuilder.append(", skippedCache: true");
     if (m_scope)
         stringBuilder.append(String::format(", scope: %d", m_scope));
 }
 
 #endif
 
 } // namespace blink