[Win10 sandbox mitigations] Four new Win10 mitigations added.

sandbox/win/src/sandbox_policy.h

Index: sandbox/win/src/sandbox_policy.h
diff --git a/sandbox/win/src/sandbox_policy.h b/sandbox/win/src/sandbox_policy.h
index cc39c6283950ebc3ba6d29e38d0fbd1d58a2bed7..43b272b640e720cd3670fe8bc93b7c97ec797e0a 100644
--- a/sandbox/win/src/sandbox_policy.h
+++ b/sandbox/win/src/sandbox_policy.h
@@ -135,6 +135,9 @@ class TargetPolicy {
   virtual ResultCode SetJobLevel(JobLevel job_level,
                                  uint32_t ui_exceptions) = 0;
 
+  // Returns the job level.
+  virtual JobLevel GetJobLevel() const = 0;
+
   // Sets a hard limit on the size of the commit set for the sandboxed process.
   // If the limit is reached, the process will be terminated with
   // SBOX_FATAL_MEMORY_EXCEEDED (7012).