Replace PP_ALLOW_THIS_IN_INITIALIZER_LIST macro

ppapi/api/pp_macros.idl

Index: ppapi/api/pp_macros.idl
diff --git a/ppapi/api/pp_macros.idl b/ppapi/api/pp_macros.idl
index f189d4a9361939972cd8bcc43b3cb59ca0480ab2..fc6e4ad898bd90c37079519ea5cc173f009a94cd 100644
--- a/ppapi/api/pp_macros.idl
+++ b/ppapi/api/pp_macros.idl
@@ -86,6 +86,22 @@ PP_COMPILE_ASSERT_SIZE_IN_BYTES_IMPL(NAME, struct NAME, SIZE)
 #define PP_COMPILE_ASSERT_ENUM_SIZE_IN_BYTES(NAME, SIZE) \
 PP_COMPILE_ASSERT_SIZE_IN_BYTES_IMPL(NAME, enum NAME, SIZE)
 
+/* This is roughly copied from base/compiler_specific.h, and makes it possible
+   to pass 'this' in a constructor initializer list, when you really mean it.
+   E.g.:
+   Foo::Foo(MyInstance* instance)
+       : PP_ALLOW_THIS_IN_INITIALIZER_LIST(callback_factory_(this)) {}
+ */
+#if defined(COMPILER_MSVC)
+# define PP_ALLOW_THIS_IN_INITIALIZER_LIST(code) \
+    __pragma(warning(push)) \
+    __pragma(warning(disable:4355)) \
+    code \
+    __pragma(warning(pop))
+#else
+# define PP_ALLOW_THIS_IN_INITIALIZER_LIST(code) code
+#endif
+
 /**
  * @}
  * End of addtogroup PP