Add version-specific defines for each C interface.

ppapi/c/dev/ppb_gles_chromium_texture_mapping_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_GLES_CHROMIUM_TEXTURE_MAPPING_DEV_H_
 #define PPAPI_C_DEV_PPB_GLES_CHROMIUM_TEXTURE_MAPPING_DEV_H_
 
 #include "ppapi/c/pp_resource.h"
 #include "ppapi/c/dev/ppb_opengles_dev.h"
 
-#define PPB_GLES_CHROMIUM_TEXTURE_MAPPING_DEV_INTERFACE "PPB_GLESChromiumTextureMapping(Dev);0.1"
+#define PPB_GLES_CHROMIUM_TEXTURE_MAPPING_DEV_INTERFACE_0_1 \
+    "PPB_GLESChromiumTextureMapping(Dev);0.1"
+#define PPB_GLES_CHROMIUM_TEXTURE_MAPPING_DEV_INTERFACE \
+    PPB_GLES_CHROMIUM_TEXTURE_MAPPING_DEV_INTERFACE_0_1
 
 struct PPB_GLESChromiumTextureMapping_Dev {
   // Maps the sub-image of a texture. 'level', 'xoffset', 'yoffset', 'width',
   // 'height', 'format' and 'type' correspond to the similarly named parameters
   // of TexSubImage2D, and define the sub-image region, as well as the format of
   // the data. 'access' must be one of GL_READ_ONLY, GL_WRITE_ONLY or
   // GL_READ_WRITE. If READ is included, the returned buffer will contain the
   // pixel data for the sub-image. If WRITE is included, the pixel data for the
   // sub-image will be updated to the contents of the buffer when
   // UnmapTexSubImage2DCHROMIUM is called. NOTE: for a GL_WRITE_ONLY map, it
@@ skipping 10 matching lines @@
      GLenum type,
      GLenum access);
 
   // Unmaps the sub-image of a texture. If the sub-image was mapped with one of
   // the WRITE accesses, the pixels are updated at this time to the contents of
   // the buffer. 'mem' must be the pointer returned by MapTexSubImage2DCHROMIUM.
   void (*UnmapTexSubImage2DCHROMIUM)(PP_Resource context, const void* mem);
 };
 
 #endif  // PPAPI_C_DEV_PPB_GLES_CHROMIUM_TEXTURE_MAPPING_DEV_H_