go/system: adding two-phase data pipe methods

mojo/public/go/system/c_allocators.h

 // Copyright 2015 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 MOJO_PUBLIC_GO_SYSTEM_C_ALLOCATORS_H_
 #define MOJO_PUBLIC_GO_SYSTEM_C_ALLOCATORS_H_
 
 #include <stdint.h>
 #include "mojo/public/c/system/core.h"
 
@@ skipping 108 matching lines @@
 struct DataArray MallocDataArray(uint32_t length);
 void FreeDataArray(struct DataArray array);
 
 struct WriteDataParams {
   uint32_t* num_bytes;
   void* elements;
 };
 struct WriteDataParams MallocWriteDataParams(uint32_t length);
 void FreeWriteDataParams(struct WriteDataParams p);
 
+struct TwoPhaseActionParams {
+  void** buffer;
+  uint32_t* num_bytes;
+};
+struct TwoPhaseActionParams MallocTwoPhaseActionParams();
+void FreeTwoPhaseActionParams(struct TwoPhaseActionParams p);
+
 #endif  // MOJO_PUBLIC_GO_SYSTEM_C_ALLOCATORS_H_