Introduce ChannelMojo

ipc/ipc_export.h

Index: ipc/ipc_export.h
diff --git a/ipc/ipc_export.h b/ipc/ipc_export.h
index 776b3ee5e756efc758359b87248ece5d4b7c172a..9f8411c3cee11fc37a0c3f04a26749cfe5e10fae 100644
--- a/ipc/ipc_export.h
+++ b/ipc/ipc_export.h
@@ -17,16 +17,31 @@
 #define IPC_EXPORT __declspec(dllimport)
 #endif  // defined(IPC_IMPLEMENTATION)
 
+#if defined(IPC_MOJO_IMPLEMENTATION)

[darin (slow to review), 2014/07/23 23:03:33]

why do we need a different component? can we just use the existing one?

[Hajime Morrita, 2014/07/24 00:38:44]

I tried to make this part of IPC and let ipc depends on mojo, but a bot  blamed
that it created a circular dependency. 

+#define IPC_MOJO_EXPORT __declspec(dllexport)
+#else
+#define IPC_MOJO_EXPORT __declspec(dllimport)
+#endif  // defined(IPC_MOJO_IMPLEMENTATION)
+
 #else  // defined(WIN32)
+
 #if defined(IPC_IMPLEMENTATION)
 #define IPC_EXPORT __attribute__((visibility("default")))
 #else
 #define IPC_EXPORT
 #endif
+
+#if defined(IPC_MOJO_IMPLEMENTATION)
+#define IPC_MOJO_EXPORT __attribute__((visibility("default")))
+#else
+#define IPC_MOJO_EXPORT
+#endif
+
 #endif
 
 #else  // defined(COMPONENT_BUILD)
 #define IPC_EXPORT
+#define IPC_MOJO_EXPORT
 #endif
 
 #endif  // IPC_IPC_EXPORT_H_