Disable copy and assignment for DisplayItemClient

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

 // 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.
 
 #ifndef DisplayItemClient_h
 #define DisplayItemClient_h
 
 #include "platform/PlatformExport.h"
 #include "platform/geometry/LayoutRect.h"
 #include "platform/graphics/PaintInvalidationReason.h"
@@ skipping 27 matching lines @@
   // Called when the DisplayItemClient is sure that it can safely die before its
   // owners have chance to remove it from the aliveness control.
   void endShouldKeepAlive() const;
 
   // Clears all should-keep-alive DisplayItemClients of a PaintController.
   // Called after PaintController commits new display items or the subsequence
   // owner is invalidated.
   static void endShouldKeepAliveAllClients(const void* owner);
   static void endShouldKeepAliveAllClients();
 #else
+  DisplayItemClient() {}
   virtual ~DisplayItemClient() {}
 #endif
 
   virtual String debugName() const = 0;
 
   // The visual rect of this DisplayItemClient, in the object space of the
   // object that owns the GraphicsLayer, i.e. offset by
   // offsetFromLayoutObjectWithSubpixelAccumulation().
   virtual LayoutRect visualRect() const = 0;
 
@@ skipping 106 matching lines @@
   bool displayItemsAreCached(CacheGenerationOrInvalidationReason other) const {
     return m_cacheGenerationOrInvalidationReason.matches(other);
   }
   void setDisplayItemsCached(
       CacheGenerationOrInvalidationReason cacheGeneration) const {
     m_cacheGenerationOrInvalidationReason = cacheGeneration;
   }
 
   mutable CacheGenerationOrInvalidationReason
       m_cacheGenerationOrInvalidationReason;
+
+  DISALLOW_COPY_AND_ASSIGN(DisplayItemClient);
 };
 
 inline bool operator==(const DisplayItemClient& client1,
                        const DisplayItemClient& client2) {
   return &client1 == &client2;
 }
 inline bool operator!=(const DisplayItemClient& client1,
                        const DisplayItemClient& client2) {
   return &client1 != &client2;
 }
 
 }  // namespace blink
 
 #endif  // DisplayItemClient_h