Move CrossThreadCopier from platform/ to wtf/

third_party/WebKit/Source/wtf/Functional.h

Index: third_party/WebKit/Source/wtf/Functional.h
diff --git a/third_party/WebKit/Source/wtf/Functional.h b/third_party/WebKit/Source/wtf/Functional.h
index c23fdc7ef54b4f9943bafff3c162db667f9cc85e..34f721557c687bf5fb58009f24ec7e367afb56dc 100644
--- a/third_party/WebKit/Source/wtf/Functional.h
+++ b/third_party/WebKit/Source/wtf/Functional.h
@@ -30,6 +30,7 @@
 #include "base/threading/thread_checker.h"
 #include "wtf/Allocator.h"
 #include "wtf/Assertions.h"
+#include "wtf/CrossThreadCopier.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/PtrUtil.h"
 #include "wtf/RefPtr.h"
@@ -130,6 +131,13 @@ PassedWrapper<T> passed(T&& value)
     return PassedWrapper<T>(std::move(value));
 }
 
+template <typename T>
+struct CrossThreadCopier<PassedWrapper<T>> {
+    STATIC_ONLY(CrossThreadCopier);
+    using Type = PassedWrapper<typename CrossThreadCopier<T>::Type>;
+    static Type copy(PassedWrapper<T>&& value) { return passed(CrossThreadCopier<T>::copy(value.moveOut())); }
+};
+
 template <typename T, FunctionThreadAffinity threadAffinity>
 class UnretainedWrapper final {
 public:
@@ -154,6 +162,11 @@ UnretainedWrapper<T, CrossThreadAffinity> crossThreadUnretained(T* value)
     return UnretainedWrapper<T, CrossThreadAffinity>(value);
 }
 
+template<typename T>
+struct CrossThreadCopier<UnretainedWrapper<T, CrossThreadAffinity>> : public CrossThreadCopierPassThrough<UnretainedWrapper<T, CrossThreadAffinity>> {
+    STATIC_ONLY(CrossThreadCopier);
+};
+
 template <typename T>
 struct ParamStorageTraits {
     typedef T StorageType;