Compile under-invalidation checking in all builds

third_party/WebKit/Source/platform/graphics/paint/ScrollDisplayItem.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 ScrollDisplayItem_h
 #define ScrollDisplayItem_h
 
 #include "platform/geometry/IntSize.h"
 #include "platform/graphics/paint/DisplayItem.h"
 #include "wtf/Allocator.h"
@@ skipping 11 matching lines @@
 
     void replay(GraphicsContext&) const override;
     void appendToWebDisplayItemList(const IntRect&, WebDisplayItemList*) const override;
 
     const IntSize& currentOffset() const { return m_currentOffset; }
 
 private:
 #ifndef NDEBUG
     void dumpPropertiesAsDebugString(WTF::StringBuilder&) const final;
 #endif
-#if ENABLE(ASSERT)
     bool equals(const DisplayItem& other) const final
     {
         return DisplayItem::equals(other)
             && m_currentOffset == static_cast<const BeginScrollDisplayItem&>(other).m_currentOffset;
     }
-#endif
 
     const IntSize m_currentOffset;
 };
 
 class PLATFORM_EXPORT EndScrollDisplayItem final : public PairedEndDisplayItem {
 public:
     EndScrollDisplayItem(const DisplayItemClient& client, Type type)
         : PairedEndDisplayItem(client, type, sizeof(*this))
     {
         ASSERT(isEndScrollType(type));
     }
 
     void replay(GraphicsContext&) const override;
     void appendToWebDisplayItemList(const IntRect&, WebDisplayItemList*) const override;
 
 private:
 #if ENABLE(ASSERT)
     bool isEndAndPairedWith(DisplayItem::Type otherType) const final { return DisplayItem::isScrollType(otherType); }
 #endif
 };
 
 } // namespace blink
 
 #endif // ScrollDisplayItem_h