Client side display item cache flag

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

Index: third_party/WebKit/Source/platform/graphics/paint/DisplayItemClient.cpp
diff --git a/third_party/WebKit/Source/platform/graphics/paint/DisplayItemClient.cpp b/third_party/WebKit/Source/platform/graphics/paint/DisplayItemClient.cpp
index eeb5b2f02665a9ba0f18dfc96add945f8c7b417d..1bb0c826c70e2303f58d4dd444c4bafc3d169a91 100644
--- a/third_party/WebKit/Source/platform/graphics/paint/DisplayItemClient.cpp
+++ b/third_party/WebKit/Source/platform/graphics/paint/DisplayItemClient.cpp
@@ -5,11 +5,15 @@
 #include "platform/graphics/paint/DisplayItemClient.h"
 
 #if ENABLE(ASSERT)
-
 #include "wtf/HashSet.h"
+#endif
 
 namespace blink {
 
+DisplayItemCacheGeneration::Generation DisplayItemCacheGeneration::s_nextGeneration = 1;
+
+#if ENABLE(ASSERT)
+
 HashSet<const DisplayItemClient*>* liveDisplayItemClients = nullptr;
 
 DisplayItemClient::DisplayItemClient()
@@ -29,6 +33,6 @@ bool DisplayItemClient::isAlive(const DisplayItemClient& client)
     return liveDisplayItemClients && liveDisplayItemClients->contains(&client);
 }
 
-} // namespace blink
-
 #endif // ENABLE(ASSERT)
+
+} // namespace blink