Linux sandbox: Restrict sched_* syscalls on the GPU and ppapi processes.

sandbox/linux/seccomp-bpf-helpers/baseline_policy.h

Index: sandbox/linux/seccomp-bpf-helpers/baseline_policy.h
diff --git a/sandbox/linux/seccomp-bpf-helpers/baseline_policy.h b/sandbox/linux/seccomp-bpf-helpers/baseline_policy.h
index 8f842f09fdd9826dcbbbb05a7656313a9c6d8e6b..e3363d47cdf0b2064c151fbaabd6917109170aa2 100644
--- a/sandbox/linux/seccomp-bpf-helpers/baseline_policy.h
+++ b/sandbox/linux/seccomp-bpf-helpers/baseline_policy.h
@@ -32,6 +32,7 @@ class SANDBOX_EXPORT BaselinePolicy : public bpf_dsl::SandboxBPFDSLPolicy {
   virtual bpf_dsl::ResultExpr EvaluateSyscall(
       int system_call_number) const OVERRIDE;
   virtual bpf_dsl::ResultExpr InvalidSyscall() const OVERRIDE;
+  pid_t current_pid() const { return current_pid_; }
 
  private:
   int fs_denied_errno_;