PPAPI/NaCl: Make NaClIPCAdapter transfer handles more generally

gpu/command_buffer/common/command_buffer.h

 // Copyright (c) 2012 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 GPU_COMMAND_BUFFER_COMMON_COMMAND_BUFFER_H_
 #define GPU_COMMAND_BUFFER_COMMON_COMMAND_BUFFER_H_
 
 #include "../../gpu_export.h"
 #include "../common/buffer.h"
 #include "../common/constants.h"
@@ skipping 117 matching lines @@
   virtual void SetToken(int32 token) = 0;
 
   // Allows the reader to set the current parse error.
   virtual void SetParseError(error::Error) = 0;
 
   // Allows the reader to set the current context lost reason.
   // NOTE: if calling this in conjunction with SetParseError,
   // call this first.
   virtual void SetContextLostReason(error::ContextLostReason) = 0;
 
+// The NaCl Win64 build only really needs the struct definitions above; having
+// GetLastError declared would mean we'd have to also define it, and pull more
+// of gpu in to the NaCl Win64 build.
+#if !defined(NACL_WIN64)
   // TODO(apatrick): this is a temporary optimization while skia is calling
   // RendererGLContext::MakeCurrent prior to every GL call. It saves returning 6
   // ints redundantly when only the error is needed for the CommandBufferProxy
   // implementation.
   virtual error::Error GetLastError();
+#endif
 
  private:
   DISALLOW_COPY_AND_ASSIGN(CommandBuffer);
 };
 
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_COMMON_COMMAND_BUFFER_H_