Implement BroadcastChannel

third_party/WebKit/Source/platform/mojo/MojoHelper.h

 // Copyright 2016 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 MojoHelper_h
 #define MojoHelper_h
 
 #include "base/bind.h"
 #include "mojo/public/cpp/bindings/callback.h"
 #include "mojo/public/cpp/bindings/wtf_array.h"
+#include "platform/CrossThreadCopier.h"
 #include "platform/heap/HeapAllocator.h"
 #include <utility>
 
 namespace blink {
 
 namespace internal {
 
 template <typename R, typename... Args>
 R CallWTFFunction(Function<R(Args...)>* functor, Args... args)
 {
     return (*functor)(std::forward<Args>(args)...);
 }
 
 }
 
 template <typename R, typename... Args>
 base::Callback<R(Args...)> createBaseCallback(PassOwnPtr<Function<R(Args...)>> functor)
 {
     return base::Bind(&internal::CallWTFFunction<R, Args...>, base::Owned(functor.leakPtr()));
 }
 
 template <typename R, typename... Args>
 base::Callback<R(Args...)> createBaseCallback(std::unique_ptr<Function<R(Args...)>> functor)
 {
     return base::Bind(&internal::CallWTFFunction<R, Args...>, base::Owned(functor.release()));
 }
 
+template <typename T>
+struct CrossThreadCopier<mojo::InterfaceRequest<T>> {
+    STATIC_ONLY(CrossThreadCopier);
+    using Type = mojo::InterfaceRequest<T>;
+    static Type copy(Type value) { return value; /* This is in fact a move. */ }
+};
+
 } // namespace blink
 
 namespace mojo {
 
 // A |TypeConverter| that will create a |WTFArray<T>| containing a copy of the
 // contents of a |blink::HeapVector<E>|, using |TypeConverter<T, E>| to copy
 // each element. The returned array will always be non-null.
 template <typename T, typename E>
 struct TypeConverter<WTFArray<T>, blink::HeapVector<E>> {
     static WTFArray<T> Convert(const blink::HeapVector<E>& input)
     {
         WTFArray<T> result(input.size());
         for (size_t i = 0; i < input.size(); ++i)
             result[i] = TypeConverter<T, E>::Convert(input[i]);
         return std::move(result);
     }
 };
 
 } // namespace mojo
 
 #endif // MojoHelper_h