Add Go build support for GN.

mojo/public/platform/native/system_thunks.h

 // Copyright 2014 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.
 
+// Note: This header should be compilable as C.
+
 #ifndef MOJO_PUBLIC_PLATFORM_NATIVE_SYSTEM_THUNKS_H_
 #define MOJO_PUBLIC_PLATFORM_NATIVE_SYSTEM_THUNKS_H_
 
 #include <stddef.h>
 
 #include "mojo/public/c/system/core.h"
 
 // The embedder needs to bind the basic Mojo Core functions of a DSO to those of
 // the embedder when loading a DSO that is dependent on mojo_system.
 // The typical usage would look like:
@@ skipping 21 matching lines @@
   size_t size;  // Should be set to sizeof(MojoSystemThunks).
   MojoTimeTicks (*GetTimeTicksNow)();
   MojoResult (*Close)(MojoHandle handle);
   MojoResult (*Wait)(MojoHandle handle,
                      MojoHandleSignals signals,
                      MojoDeadline deadline);
   MojoResult (*WaitMany)(const MojoHandle* handles,
                          const MojoHandleSignals* signals,
                          uint32_t num_handles,
                          MojoDeadline deadline);
-  MojoResult (*CreateMessagePipe)(const MojoCreateMessagePipeOptions* options,
-                                  MojoHandle* message_pipe_handle0,
-                                  MojoHandle* message_pipe_handle1);
+  MojoResult (*CreateMessagePipe)(
+      const struct MojoCreateMessagePipeOptions* options,
+      MojoHandle* message_pipe_handle0,
+      MojoHandle* message_pipe_handle1);
   MojoResult (*WriteMessage)(MojoHandle message_pipe_handle,
                              const void* bytes,
                              uint32_t num_bytes,
                              const MojoHandle* handles,
                              uint32_t num_handles,
                              MojoWriteMessageFlags flags);
   MojoResult (*ReadMessage)(MojoHandle message_pipe_handle,
                             void* bytes,
                             uint32_t* num_bytes,
                             MojoHandle* handles,
                             uint32_t* num_handles,
                             MojoReadMessageFlags flags);
-  MojoResult (*CreateDataPipe)(const MojoCreateDataPipeOptions* options,
+  MojoResult (*CreateDataPipe)(const struct MojoCreateDataPipeOptions* options,
                                MojoHandle* data_pipe_producer_handle,
                                MojoHandle* data_pipe_consumer_handle);
   MojoResult (*WriteData)(MojoHandle data_pipe_producer_handle,
                           const void* elements,
                           uint32_t* num_elements,
                           MojoWriteDataFlags flags);
   MojoResult (*BeginWriteData)(MojoHandle data_pipe_producer_handle,
                                void** buffer,
                                uint32_t* buffer_num_elements,
                                MojoWriteDataFlags flags);
   MojoResult (*EndWriteData)(MojoHandle data_pipe_producer_handle,
                              uint32_t num_elements_written);
   MojoResult (*ReadData)(MojoHandle data_pipe_consumer_handle,
                          void* elements,
                          uint32_t* num_elements,
                          MojoReadDataFlags flags);
   MojoResult (*BeginReadData)(MojoHandle data_pipe_consumer_handle,
                               const void** buffer,
                               uint32_t* buffer_num_elements,
                               MojoReadDataFlags flags);
   MojoResult (*EndReadData)(MojoHandle data_pipe_consumer_handle,
                             uint32_t num_elements_read);
   MojoResult (*CreateSharedBuffer)(
-      const MojoCreateSharedBufferOptions* options,
+      const struct MojoCreateSharedBufferOptions* options,
       uint64_t num_bytes,
       MojoHandle* shared_buffer_handle);
   MojoResult (*DuplicateBufferHandle)(
       MojoHandle buffer_handle,
-      const MojoDuplicateBufferHandleOptions* options,
+      const struct MojoDuplicateBufferHandleOptions* options,
       MojoHandle* new_buffer_handle);
   MojoResult (*MapBuffer)(MojoHandle buffer_handle,
                           uint64_t offset,
                           uint64_t num_bytes,
                           void** buffer,
                           MojoMapBufferFlags flags);
   MojoResult (*UnmapBuffer)(void* buffer);
 };
 #pragma pack(pop)
 
+
+#ifdef __cplusplus
 // Intended to be called from the embedder. Returns a |MojoCore| initialized
 // to contain pointers to each of the embedder's MojoCore functions.
 inline MojoSystemThunks MojoMakeSystemThunks() {
   MojoSystemThunks system_thunks = {
     sizeof(MojoSystemThunks),
     MojoGetTimeTicksNow,
     MojoClose,
     MojoWait,
     MojoWaitMany,
     MojoCreateMessagePipe,
     MojoWriteMessage,
     MojoReadMessage,
     MojoCreateDataPipe,
     MojoWriteData,
     MojoBeginWriteData,
     MojoEndWriteData,
     MojoReadData,
     MojoBeginReadData,
     MojoEndReadData,
     MojoCreateSharedBuffer,
     MojoDuplicateBufferHandle,
     MojoMapBuffer,
     MojoUnmapBuffer
   };
   return system_thunks;
 }
+#endif
+
 
 // Use this type for the function found by dynamically discovering it in
 // a DSO linked with mojo_system. For example:
 // MojoSetSystemThunksFn mojo_set_system_thunks_fn =
 //     reinterpret_cast<MojoSetSystemThunksFn>(app_library.GetFunctionPointer(
 //         "MojoSetSystemThunks"));
 // The expected size of |system_thunks} is returned.
 // The contents of |system_thunks| are copied.
-typedef size_t (*MojoSetSystemThunksFn)(const MojoSystemThunks* system_thunks);
+typedef size_t (*MojoSetSystemThunksFn)(
+    const struct MojoSystemThunks* system_thunks);
 
 #endif  // MOJO_PUBLIC_PLATFORM_NATIVE_SYSTEM_THUNKS_H_