Add support for generating thunk source from IDL.

ppapi/generators/test_thunk/basic_test_types.idl

Index: ppapi/generators/test_thunk/basic_test_types.idl
diff --git a/ppapi/generators/test_cgen/stdint.idl b/ppapi/generators/test_thunk/basic_test_types.idl
similarity index 85%
copy from ppapi/generators/test_cgen/stdint.idl
copy to ppapi/generators/test_thunk/basic_test_types.idl
index f63a66a46ed3a480dfd29499487155995f616e97..0f424668b0a7e95960b9274d7c00c5385e521923 100644
--- a/ppapi/generators/test_cgen/stdint.idl
+++ b/ppapi/generators/test_thunk/basic_test_types.idl
@@ -4,9 +4,7 @@
  */
 
 /**
- * This file provides a definition of C99 sized types
- * for Microsoft compilers. These definitions only apply
- * for trusted modules.
+ * This file defines some basic types for use in testing.
  */
 
 label Chrome {
@@ -50,5 +48,11 @@ describe {
 
   /** Pointer to pointer to memory (void **). */
   blob_t;
+
+  /** Pepper types */
+  PP_Bool;
+  PP_Instance;
+  PP_Resource;
+  PP_Var;
 };