Disable copy and assignment for DisplayItemClient

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

Index: third_party/WebKit/Source/platform/graphics/paint/DisplayItemClient.h
diff --git a/third_party/WebKit/Source/platform/graphics/paint/DisplayItemClient.h b/third_party/WebKit/Source/platform/graphics/paint/DisplayItemClient.h
index fb47d824b2b8949868f9534a8010b5327d59d635..9d8c80132b05d771e7ecdb1f79ed14c2ea1d0ea5 100644
--- a/third_party/WebKit/Source/platform/graphics/paint/DisplayItemClient.h
+++ b/third_party/WebKit/Source/platform/graphics/paint/DisplayItemClient.h
@@ -45,6 +45,7 @@ class PLATFORM_EXPORT DisplayItemClient {
   static void endShouldKeepAliveAllClients(const void* owner);
   static void endShouldKeepAliveAllClients();
 #else
+  DisplayItemClient() {}
   virtual ~DisplayItemClient() {}
 #endif
 
@@ -171,6 +172,8 @@ class PLATFORM_EXPORT DisplayItemClient {
 
   mutable CacheGenerationOrInvalidationReason
       m_cacheGenerationOrInvalidationReason;
+
+  DISALLOW_COPY_AND_ASSIGN(DisplayItemClient);
 };
 
 inline bool operator==(const DisplayItemClient& client1,