[Android] Allow setsockopt(<fd>, SOL_SOCKET, SO_SNDBUF, ...)

Crash analysis shows this as a low-volume violation on stable.

Cq-Include-Trybots: master.tryserver.chromium.android:android_arm64_dbg_recipe;master.tryserver.chromium.android:android_compile_mips_dbg;master.tryserver.chromium.android:android_compile_x64_dbg;master.tryserver.chromium.android:android_compile_x86_dbg
Change-Id: I1a077a5f1f3e975162138fc394766acc9354c9c7
Reviewed-on: https://chromium-review.googlesource.com/848643Reviewed-by: Jorge Lucangeli Obes <jorgelo@chromium.org>
Commit-Queue: Robert Sesek <rsesek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#526904}

sandbox/linux/seccomp-bpf-helpers/baseline_policy_android.cc

@@ -205,6 +205,7 @@ ResultExpr BaselinePolicyAndroid::EvaluateSyscall(int sysno) const {
     return If(AllOf(level == SOL_SOCKET,
                     AnyOf(option == SO_SNDTIMEO,
                           option == SO_RCVTIMEO,
+                          option == SO_SNDBUF,
                           option == SO_REUSEADDR)),
               Allow())
            .Else(BaselinePolicy::EvaluateSyscall(sysno));