Fix alignment issue of ContiguousContainer

third_party/WebKit/Source/platform/graphics/paint/DrawingDisplayItem.h

 // 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.
 
 #ifndef DrawingDisplayItem_h
 #define DrawingDisplayItem_h
 
 #include "platform/PlatformExport.h"
 #include "platform/RuntimeEnabledFeatures.h"
 #include "platform/geometry/FloatPoint.h"
 #include "platform/graphics/paint/DisplayItem.h"
 #include "third_party/skia/include/core/SkPicture.h"
 
 namespace blink {
 
-class PLATFORM_EXPORT DrawingDisplayItem final : public DisplayItem {
+class PLATFORM_EXPORT DrawingDisplayItem final : public DisplayItemBase<DrawingDisplayItem> {
 public:
 #if ENABLE(ASSERT)
     enum UnderInvalidationCheckingMode {
         CheckPicture, // Check if the new picture and the old picture are the same
         CheckBitmap, // Check if the new picture and the old picture produce the same bitmap
     };
 #endif
 
     DrawingDisplayItem(const DisplayItemClient& client
         , Type type
         , PassRefPtr<const SkPicture> picture
         , bool knownToBeOpaque = false
 #if ENABLE(ASSERT)
         , UnderInvalidationCheckingMode underInvalidationCheckingMode = CheckPicture
 #endif
         )
-        : DisplayItem(client, type, sizeof(*this))
+        : DisplayItemBase(client, type)
         , m_picture(picture && picture->approximateOpCount() ? picture : nullptr)
         , m_knownToBeOpaque(knownToBeOpaque)
 #if ENABLE(ASSERT)
         , m_underInvalidationCheckingMode(underInvalidationCheckingMode)
 #endif
     {
         ASSERT(isDrawingType(type));
     }
 
     void replay(GraphicsContext&) const override;
@@ skipping 22 matching lines @@
     const bool m_knownToBeOpaque;
 
 #if ENABLE(ASSERT)
     UnderInvalidationCheckingMode m_underInvalidationCheckingMode;
 #endif
 };
 
 } // namespace blink
 
 #endif // DrawingDisplayItem_h