Introduce an injection point to configure the internal pointer of WeakPtr

third_party/WebKit/Source/platform/CrossThreadCopier.h

Index: third_party/WebKit/Source/platform/CrossThreadCopier.h
diff --git a/third_party/WebKit/Source/platform/CrossThreadCopier.h b/third_party/WebKit/Source/platform/CrossThreadCopier.h
index c863a4047bdba6462e1a62ff76a5f9f112326c14..7bd30c2892a4184ac2044326583712a5d9443916 100644
--- a/third_party/WebKit/Source/platform/CrossThreadCopier.h
+++ b/third_party/WebKit/Source/platform/CrossThreadCopier.h
@@ -32,6 +32,7 @@
 #define CrossThreadCopier_h
 
 #include "platform/PlatformExport.h"
+#include "platform/heap/Persistent.h"
 #include "third_party/skia/include/core/SkRefCnt.h"
 #include "wtf/Assertions.h"
 #include "wtf/Forward.h"
@@ -144,7 +145,12 @@ struct CrossThreadCopier<CrossThreadPersistent<T>> : public CrossThreadCopierPas
     STATIC_ONLY(CrossThreadCopier);
 };
 
-template<typename T>
+template <typename T>
+struct CrossThreadCopier<WTF::WeakPtr<T>> : public CrossThreadCopierPassThrough<WTF::WeakPtr<T>> {
+    STATIC_ONLY(CrossThreadCopier);
+};
+
+template <typename T>
 struct CrossThreadCopier<CrossThreadWeakPersistent<T>> : public CrossThreadCopierPassThrough<CrossThreadWeakPersistent<T>> {
     STATIC_ONLY(CrossThreadCopier);
 };
@@ -154,8 +160,8 @@ struct CrossThreadCopier<WTF::UnretainedWrapper<T, WTF::CrossThreadAffinity>> :
     STATIC_ONLY(CrossThreadCopier);
 };
 
-template<typename T>
-struct CrossThreadCopier<WeakPtr<T>> : public CrossThreadCopierPassThrough<WeakPtr<T>> {
+template <typename T>
+struct CrossThreadCopier<RevocableCrossThreadWeakPersistent<T>> : public CrossThreadCopierPassThrough<RevocableCrossThreadWeakPersistent<T>> {
     STATIC_ONLY(CrossThreadCopier);
 };