Add thunks for wait set operations, together with public tests.

mojo/public/c/system/tests/data_pipe_unittest.cc

 // 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.
 
 // This file tests the C data pipe API (the functions declared in
 // mojo/public/c/system/data_pipe.h).
 
+#include "mojo/public/c/system/data_pipe.h"
+
 #include <string.h>
 
-#include "mojo/public/c/system/data_pipe.h"
 #include "mojo/public/c/system/handle.h"
 #include "mojo/public/c/system/result.h"
 #include "mojo/public/c/system/wait.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace {
 
 const MojoHandleRights kDefaultDataPipeProducerHandleRights =
     MOJO_HANDLE_RIGHT_TRANSFER | MOJO_HANDLE_RIGHT_WRITE |
     MOJO_HANDLE_RIGHT_GET_OPTIONS | MOJO_HANDLE_RIGHT_SET_OPTIONS;
@@ skipping 415 matching lines @@
   EXPECT_EQ(MOJO_RESULT_OK,
             MojoWait(hc, MOJO_HANDLE_SIGNAL_READ_THRESHOLD, 0, nullptr));
 
   EXPECT_EQ(MOJO_RESULT_OK, MojoClose(hp));
   EXPECT_EQ(MOJO_RESULT_OK, MojoClose(hc));
 }
 
 // TODO(vtl): Add multi-threaded tests.
 
 }  // namespace