Mojo: Add a "GetType()" to Dispatchers.

mojo/system/data_pipe_consumer_dispatcher.cc

Index: mojo/system/data_pipe_consumer_dispatcher.cc
diff --git a/mojo/system/data_pipe_consumer_dispatcher.cc b/mojo/system/data_pipe_consumer_dispatcher.cc
index 6b80931df52e09189e6fb324e47c9046a4ebb85f..ffbf7437ba78eb3fbbaa7149ed3ae3581b3f6031 100644
--- a/mojo/system/data_pipe_consumer_dispatcher.cc
+++ b/mojo/system/data_pipe_consumer_dispatcher.cc
@@ -19,6 +19,10 @@ void DataPipeConsumerDispatcher::Init(scoped_refptr<DataPipe> data_pipe) {
   data_pipe_ = data_pipe;
 }
 
+Dispatcher::Type DataPipeConsumerDispatcher::GetType() {
+  return kTypeDataPipeConsumer;
+}
+
 DataPipeConsumerDispatcher::~DataPipeConsumerDispatcher() {
   // |Close()|/|CloseImplNoLock()| should have taken care of the pipe.
   DCHECK(!data_pipe_.get());