Implement off-the-wire validation scheme for enum types.

chrome/tools/ipclist/ipcfuzz.cc

Index: chrome/tools/ipclist/ipcfuzz.cc
diff --git a/chrome/tools/ipclist/ipcfuzz.cc b/chrome/tools/ipclist/ipcfuzz.cc
index 1d288c57f5db4cdf6a91aa6cc2bec70c3ea6d01e..764c0cffb8bd55fb2e683803a5ff574e4063ad91 100644
--- a/chrome/tools/ipclist/ipcfuzz.cc
+++ b/chrome/tools/ipclist/ipcfuzz.cc
@@ -510,13 +510,11 @@ class PickleCracker : public Pickle {
 #include "ipc/ipc_message_null_macros.h"
 
 // STRUCT declarations cause corresponding STRUCT_TRAITS declarations to occur.
-#undef IPC_STRUCT_BEGIN
 #undef IPC_STRUCT_BEGIN_WITH_PARENT
 #undef IPC_STRUCT_MEMBER
 #undef IPC_STRUCT_END
 #define IPC_STRUCT_BEGIN_WITH_PARENT(struct_name, parent)\
-  IPC_STRUCT_BEGIN(struct_name)
-#define IPC_STRUCT_BEGIN(struct_name) IPC_STRUCT_TRAITS_BEGIN(struct_name)
+  IPC_STRUCT_TRAITS_BEGIN(struct_name)
 #define IPC_STRUCT_MEMBER(type, name, ...) IPC_STRUCT_TRAITS_MEMBER(name)
 #define IPC_STRUCT_END() IPC_STRUCT_TRAITS_END()
 
@@ -540,8 +538,8 @@ class PickleCracker : public Pickle {
     } \
   };
 
-#undef IPC_ENUM_TRAITS
-#define IPC_ENUM_TRAITS(enum_name) \
+#undef IPC_ENUM_TRAITS_VALIDATE
+#define IPC_ENUM_TRAITS_VALIDATE(enum_name, validation_expression) \
   template <> \
   struct FuzzTraits<enum_name> { \
     static void Fuzz(enum_name* p, IPC::Fuzzer* fuzzer) { \