Add version-specific defines for each C interface.

ppapi/c/dev/ppb_testing_dev.h

 /* Copyright (c) 2010 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_TESTING_DEV_H_
 #define PPAPI_C_DEV_PPB_TESTING_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"
 
 struct PP_Point;
 
-#define PPB_TESTING_DEV_INTERFACE "PPB_Testing(Dev);0.6"
+#define PPB_TESTING_DEV_INTERFACE_0_6 "PPB_Testing(Dev);0.6"
+#define PPB_TESTING_DEV_INTERFACE PPB_TESTING_DEV_INTERFACE_0_6
 
 // This interface contains functions used for unit testing. Do not use in
 // production code. They are not guaranteed to be available in normal plugin
 // environments so you should not depend on them.
 struct PPB_Testing_Dev {
   // Reads the bitmap data out of the backing store for the given
   // DeviceContext2D and into the given image. If the data was successfully
   // read, it will return PP_TRUE.
   //
   // This function should not generally be necessary for normal plugin
@@ skipping 38 matching lines @@
   void (*QuitMessageLoop)(PP_Instance instance);
 
   // Returns the number of live objects (resources + strings + objects)
   // associated with this plugin instance. Used for detecting leaks. Returns
   // (uint32_t)-1 on failure.
   uint32_t (*GetLiveObjectsForInstance)(PP_Instance instance);
 };
 
 #endif  /* PPAPI_C_DEV_PPB_TESTING_DEV_H_ */