Update PPAPI IDL generator to define versioned structs, and unversioned typedef.

ppapi/c/dev/ppb_gles_chromium_texture_mapping_dev.h

Index: ppapi/c/dev/ppb_gles_chromium_texture_mapping_dev.h
diff --git a/ppapi/c/dev/ppb_gles_chromium_texture_mapping_dev.h b/ppapi/c/dev/ppb_gles_chromium_texture_mapping_dev.h
index 616f66178b015d15d46dbcbb7ece98797103f7f3..28d995a1231757b658d184c12faa04d59e36885d 100644
--- a/ppapi/c/dev/ppb_gles_chromium_texture_mapping_dev.h
+++ b/ppapi/c/dev/ppb_gles_chromium_texture_mapping_dev.h
@@ -13,7 +13,7 @@
 #define PPB_GLES_CHROMIUM_TEXTURE_MAPPING_DEV_INTERFACE \
     PPB_GLES_CHROMIUM_TEXTURE_MAPPING_DEV_INTERFACE_0_1
 
-struct PPB_GLESChromiumTextureMapping_Dev {
+struct PPB_GLESChromiumTextureMapping_Dev_0_1 {
   // 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
@@ -41,4 +41,7 @@ struct PPB_GLESChromiumTextureMapping_Dev {
   void (*UnmapTexSubImage2DCHROMIUM)(PP_Resource context, const void* mem);
 };
 
+typedef struct PPB_GLESChromiumTextureMapping_Dev_0_1
+    PPB_GLESChromiumTextureMapping_Dev;
+
 #endif  // PPAPI_C_DEV_PPB_GLES_CHROMIUM_TEXTURE_MAPPING_DEV_H_