Add thread affinity and ASSERT() for same-thread restriction to WTF::Function

third_party/WebKit/Source/platform/ThreadSafeFunctional.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 ThreadSafeFunctional_h
 #define ThreadSafeFunctional_h
 
 #include "platform/CrossThreadCopier.h"
 #include "wtf/Functional.h"
 
 namespace blink {
 
 // threadSafeBind() is bind() for cross-thread task posting.
 // threadSafeBind() applies CrossThreadCopier to the arguments.
 //
 // Example:
 //     void func1(int, const String&);
 //     f = threadSafeBind(func1, 42, str);
 // func1(42, str2) will be called when |f()| is executed,
 // where |str2| is a deep copy of |str| (created by str.isolatedCopy()).
 //
 // threadSafeBind(str) is similar to bind(str.isolatedCopy()), but the latter
 // is NOT thread-safe due to temporary objects (https://crbug.com/390851).
 //
 // Don't (if you pass the task across threads):
 //     bind(func1, 42, str);
 //     bind(func1, 42, str.isolatedCopy());
 
 template<typename... FreeVariableTypes, typename FunctionType, typename... Ps>
-PassOwnPtr<Function<typename WTF::FunctionWrapper<FunctionType>::ResultType(FreeVariableTypes...)>> threadSafeBind(
+PassOwnPtr<Function<typename WTF::FunctionWrapper<FunctionType>::ResultType(FreeVariableTypes...), WTF::CrossThreadAffinity>> threadSafeBind(
     FunctionType function,
     const Ps&... parameters)
 {
-    return bind<FreeVariableTypes...>(function,
+    return WTF::bindInternal<WTF::CrossThreadAffinity, FreeVariableTypes...>(
+        function,
         CrossThreadCopier<Ps>::copy(parameters)...);
 }
 
 } // namespace blink
 
 #endif // ThreadSafeFunctional_h