Add version-specific defines for each C interface.

ppapi/c/dev/ppb_context_3d_trusted_dev.h

 // Copyright (c) 2011 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 PPAPI_C_DEV_PPB_CONTEXT_3D_TRUSTED_DEV_H_
 #define PPAPI_C_DEV_PPB_CONTEXT_3D_TRUSTED_DEV_H_
 
 #include "ppapi/c/dev/ppb_context_3d_dev.h"
 #include "ppapi/c/pp_bool.h"
 #include "ppapi/c/pp_instance.h"
 #include "ppapi/c/pp_resource.h"
 #include "ppapi/c/pp_stdint.h"
 
-#define PPB_CONTEXT_3D_TRUSTED_DEV_INTERFACE "PPB_Context3DTrusted(Dev);0.3"
+#define PPB_CONTEXT_3D_TRUSTED_DEV_INTERFACE_0_3 "PPB_Context3DTrusted(Dev);0.3"
+#define PPB_CONTEXT_3D_TRUSTED_DEV_INTERFACE \
+    PPB_CONTEXT_3D_TRUSTED_DEV_INTERFACE_0_3
 
 typedef enum {
   kNoError,
   kInvalidSize,
   kOutOfBounds,
   kUnknownCommand,
   kInvalidArguments,
   kLostContext,
   kGenericError
 } PPB_Context3DTrustedError;
@@ skipping 59 matching lines @@
 
   // Get the transfer buffer associated with a handle.
   PP_Bool (*GetTransferBuffer)(PP_Resource context,
                                int32_t id,
                                int* shm_handle,
                                uint32_t* shm_size);
 };
 
 #endif  // PPAPI_C_DEV_PPB_CONTEXT_3D_TRUSTED_DEV_H_