Added a new process mitigation to harden process token IL policy.

sandbox/win/src/restricted_token_utils.h

Index: sandbox/win/src/restricted_token_utils.h
diff --git a/sandbox/win/src/restricted_token_utils.h b/sandbox/win/src/restricted_token_utils.h
index 69462b4da28b8f9ec30626222bddff1cfdebef66..509feaf74bdf5cf14507fdc581531d79bf8b826b 100644
--- a/sandbox/win/src/restricted_token_utils.h
+++ b/sandbox/win/src/restricted_token_utils.h
@@ -82,6 +82,19 @@ const wchar_t* GetIntegrityLevelString(IntegrityLevel integrity_level);
 // current integrity level, the function will fail.
 DWORD SetProcessIntegrityLevel(IntegrityLevel integrity_level);
 
+// Hardens the integrity level policy on a token. This is only valid on Win 7
+// and above. Specifically it sets the policy to block read and execute so
+// that a lower privileged process cannot open the token for impersonate or
+// duplicate permissions. This should limit potential security holes.
+DWORD HardenTokenIntegrityLevelPolicy(HANDLE token);
+
+// Hardens the integrity level policy on the current process. This is only
+// valid on Win 7 and above. Specifically it sets the policy to block read
+// and execute so that a lower privileged process cannot open the token for
+// impersonate or duplicate permissions. This should limit potential security
+// holes.
+DWORD HardenProcessIntegrityLevelPolicy();
+
 }  // namespace sandbox
 
 #endif  // SANDBOX_SRC_RESTRICTED_TOKEN_UTILS_H__