[Slimming Paint] Allow 3D transforms of different types.

Source/platform/graphics/paint/DisplayItemTransformTreeBuilder.cpp

 // Copyright 2015 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/DisplayItemTransformTreeBuilder.h"
 
 #include "platform/graphics/paint/DisplayItem.h"
 #include "platform/graphics/paint/DisplayItemTransformTree.h"
 #include "platform/graphics/paint/Transform3DDisplayItem.h"
@@ skipping 26 matching lines @@
 enum BeginDisplayItemClassification { NotATransform = 0, Only2DTranslation, RequiresTransformNode };
 
 // Classifies a display item based on whether it is a transform, and if so,
 // whether it should be get a transform node.
 // If it is a transform (including a translation), the TransformationMatrix
 // will be copied to output parameter.
 static BeginDisplayItemClassification classifyBeginItem(const DisplayItem& beginDisplayItem, TransformationMatrix* transform)
 {
     ASSERT(beginDisplayItem.isBegin());
 
-    if (beginDisplayItem.type() == DisplayItem::BeginTransform3D) {
+    if (DisplayItem::isTransform3DType(beginDisplayItem.type())) {
         const auto& begin3D = static_cast<const BeginTransform3DDisplayItem&>(beginDisplayItem);
         *transform = begin3D.transform();
         if (transform->isIdentityOr2DTranslation())
             return Only2DTranslation;
         return RequiresTransformNode;
     }
     return NotATransform;
 }
 
 } // namespace
@@ skipping 44 matching lines @@
         const auto& current = currentTransformNodeData();
         m_transformTree->appendRangeRecord(m_rangeBeginIndex, m_currentIndex, current.transformNode, current.offset);
     }
 
     // The current display item is a boundary.
     // The earliest the next range could begin is the next one.
     m_rangeBeginIndex = m_currentIndex + 1;
 }
 
 } // namespace blink