Add version-specific defines for each C interface.

ppapi/c/dev/ppb_video_decoder_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_VIDEO_DECODER_DEV_H_
 #define PPAPI_C_DEV_PPB_VIDEO_DECODER_DEV_H_
 
 #include "ppapi/c/dev/pp_video_dev.h"
 #include "ppapi/c/pp_completion_callback.h"
 #include "ppapi/c/pp_var.h"
 
-#define PPB_VIDEODECODER_DEV_INTERFACE "PPB_VideoDecoder(Dev);0.5"
+#define PPB_VIDEODECODER_DEV_INTERFACE_0_5 "PPB_VideoDecoder(Dev);0.5"
+#define PPB_VIDEODECODER_DEV_INTERFACE PPB_VIDEODECODER_DEV_INTERFACE_0_5
 
 // Video decoder interface.
 //
 // Basic usage:
 //   1. Use GetConfigs() to query potential configurations. Configuration
 //   information includes:
 //     a. Bitstream format.
 //     b. Output picture format.
 //     c. Output picture buffer storage type.
 //   2. Select configuration that suits you and Create() the decoder with the
@@ skipping 169 matching lines @@
   //   |callback| is one-time callback that will be called once the abortion
   //   request has been completed.
   //
   // Returns PP_TRUE on acceptance of abort request and PP_FALSE if request to
   // abort is rejected by the decoder.
   PP_Bool (*Abort)(PP_Resource video_decoder,
                    struct PP_CompletionCallback callback);
 };
 
 #endif  /* PPAPI_C_DEV_PPB_VIDEO_DECODER_DEV_H_ */