Implement BroadcastChannel

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

Index: third_party/WebKit/Source/platform/mojo/MojoHelper.h
diff --git a/third_party/WebKit/Source/platform/mojo/MojoHelper.h b/third_party/WebKit/Source/platform/mojo/MojoHelper.h
index cb3787823cf898aaef902d1ba64e2df021bdd0dc..07bd04deb32d77a406e80b9939d2afc22d962eb2 100644
--- a/third_party/WebKit/Source/platform/mojo/MojoHelper.h
+++ b/third_party/WebKit/Source/platform/mojo/MojoHelper.h
@@ -6,7 +6,9 @@
 #define MojoHelper_h
 
 #include "base/bind.h"
+#include "mojo/public/cpp/bindings/interface_request.h"
 #include "mojo/public/cpp/bindings/wtf_array.h"
+#include "platform/CrossThreadCopier.h"
 #include "platform/heap/HeapAllocator.h"
 #include <utility>
 
@@ -28,6 +30,13 @@ base::Callback<R(Args...)> createBaseCallback(std::unique_ptr<Function<R(Args...
     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 {