EDK: Add Dispatcher::SupportsEntrypointClass().

mojo/edk/system/data_pipe_producer_dispatcher.cc

Index: mojo/edk/system/data_pipe_producer_dispatcher.cc
diff --git a/mojo/edk/system/data_pipe_producer_dispatcher.cc b/mojo/edk/system/data_pipe_producer_dispatcher.cc
index febe21766c35ef73f213e8b1bd903e0f097e5dce..bfa7646026a5047f4f00383c2772483acfa4a4f9 100644
--- a/mojo/edk/system/data_pipe_producer_dispatcher.cc
+++ b/mojo/edk/system/data_pipe_producer_dispatcher.cc
@@ -27,6 +27,11 @@ Dispatcher::Type DataPipeProducerDispatcher::GetType() const {
   return Type::DATA_PIPE_PRODUCER;
 }
 
+bool DataPipeProducerDispatcher::SupportsEntrypointClass(
+    EntrypointClass entrypoint_class) const {
+  return (entrypoint_class == EntrypointClass::DATA_PIPE_PRODUCER);
+}
+
 // static
 RefPtr<DataPipeProducerDispatcher> DataPipeProducerDispatcher::Deserialize(
     Channel* channel,