Add version-specific defines for each C interface.

ppapi/c/dev/ppb_console_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_CONSOLE_DEV_H_
 #define PPAPI_C_DEV_PPB_CONSOLE_DEV_H_
 
 #include "ppapi/c/pp_instance.h"
 #include "ppapi/c/pp_var.h"
 
-#define PPB_CONSOLE_DEV_INTERFACE "PPB_Console(Dev);0.1"
+#define PPB_CONSOLE_DEV_INTERFACE_0_1 "PPB_Console(Dev);0.1"
+#define PPB_CONSOLE_DEV_INTERFACE PPB_CONSOLE_DEV_INTERFACE_0_1
 
 typedef enum {
   PP_LOGLEVEL_TIP = 0,
   PP_LOGLEVEL_LOG,
   PP_LOGLEVEL_WARNING,
   PP_LOGLEVEL_ERROR
 } PP_LogLevel_Dev;
 
 struct PPB_Console_Dev {
   /**
@@ skipping 14 matching lines @@
    * interpreter, you would want log messages to contain the source .py file
    * doing the log statement rather than have "python" show up in the console.
    */
   void (*LogWithSource)(PP_Instance instance,
                         PP_LogLevel_Dev level,
                         struct PP_Var source,
                         struct PP_Var value);
 };
 
 #endif  // PPAPI_C_DEV_PPB_CONSOLE_DEV_H_